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Who will win the next Ghanian parliamentary election? — NDC

KXGHANAPARLI-28-NDC · Elections · 2026-04-29
56%
Agent
57%
Market Price
-1.0%
Edge
40%
Confidence
Volume: 10,161
Spread: 1.0c
Days to resolution: 1318
Markets in event: 2
Final Rationale
I ACCEPT the critic's challenges 1-3: including sq4 (two-party dominance at 96%) in the weighted average artificially pulled my estimate toward 50/50 without discriminating between NDC and NPP outcomes, and sq1/sq2/sq3 are highly correlated angles on the same question. Correcting for sq4 dilution and weighting the NDC-specific evidence (184/276 seat landslide, Ablekuma North by-election win, NPP collapse with Bawumia polling ~16%) more heavily lifts my estimate to ~0.55-0.57. I PARTIALLY ACCEPT challenge 4 — the 2024 landslide is genuinely an outlier that weakens the symmetric anti-incumbency base rate, but Mahama's term limit and 3.6-year horizon still impose real downside risk. The market at 57% (low liquidity, shallow depth) happens to align with my corrected estimate, so I converge to 0.56 — driven by the methodological correction, not market deference.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 58$ follow-ups
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: article_search web_search wikipedia_lookup kalshi_data code_execution
Sub-questions (Fermi decomposition)
  1. Will the NDC maintain or grow its current political dominance heading into the 2028 Ghanaian parliamentary election, based on performance in the 2024 election and subsequent by-elections? (w=0.35)
  2. Will the NPP be unable to mount a sufficiently competitive challenge to reclaim parliamentary majority by 2028? (w=0.30)
  3. Will NDC's incumbent presidential advantage (having won the 2024 presidential election) translate into a parliamentary majority win in 2028? (w=0.25)
  4. Will no third party or coalition disrupt the traditional NDC-NPP two-party dominance of Ghanaian parliamentary elections by 2028? (w=0.10)
Planner reasoning
This question asks about the 2028 Ghanaian parliamentary election, with ~1318 days remaining. Key analytical dimensions: 1. **Historical base rates**: Ghana has alternated between NDC and NPP dominance in a fairly regular pattern. The NDC won a strong majority in the 2024 parliamentary election alongside John Mahama's presidential victory. The critical question is whether incumbents retain parliament — Ghana's pattern shows roughly 3-4 elections of one party followed by a switch, suggesting NDC could retain in 2028 after winning in 2024. 2. **Incumbency dynamics**: The NDC holds both the presidency and parliament as of 2024/2025. Presidential incumbents in Ghana have only won re-election twice (Rawlings 1996, Kufuor 2004, Mahama failed in 2016). However, Mahama won again in 2024 after being out. The 2028 election will be a referendum on NDC's governance — economic performance, especially if Ghana's IMF program succeeds or fails, will be decisive. 3. **Temporal sequence for YES**: NDC must (a) manage economy reasonably well 2025-2028, (b) not face a major internal party split, (c) maintain organizational advantage, and (d) face a still-rebuilding NPP. Given NPP's crushing 2024 defeat, they will need 4 years to reorganize — this is a tight timeline but not impossible. 4. **Reference class**: In African democracies with strong two-party systems, incumbents with both executive and legislative power tend to win re-election at higher rates than pure alternation would suggest. However, Ghana's unusually competitive democracy and economic sensitivity (highly correlated with commodity prices/cocoa/gold/oil) means economic shocks can rapidly shift outcomes. 5. **Key uncertainties**: Ghana's debt restructuring under IMF, global commodity prices, NPP leadership renewal, and whether NDC can deliver on economic promises under Mahama (who was already president 2012-2016).
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
article_search OK 0.7s -
web_search OK 57.7s -
wikipedia_lookup OK 1.8s -
kalshi_data OK 1.8s -
code_execution OK 0.0s -
3. Evidence Synthesis Sonnet · 15 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG 92 ↑ UP web_search + wikipedia_lookup NDC won a landslide in the December 2024 Ghanaian parliamentary election, securing 184 out of 276 seats (up from 137 in 2020), while NPP collapsed to 88 seats from 137. Yes
2 STRONG 82 ↑ UP web_search NDC won the Ablekuma North by-election on 11 July 2025 — the first time NDC had won that constituency since the Fourth Republic began — extending their parliamentary dominance beyond the general election result. Yes
3 MODERATE 72 ↑ UP web_search NDC General Secretary described the 2024 victory as a 'green wave,' with NDC winning seats it had never previously secured, suggesting unusually broad geographic penetration. Yes
4 STRONG 88 ↓ DOWN code_execution Historical base rate: Ghanaian parliamentary incumbents have retained their majority only 3 out of 7 times (42.9%) since 2000, indicating significant electoral volatility. No
5 MODERATE 80 NEUTRAL wikipedia_lookup Ghana's NDC was founded by Jerry Rawlings and has been one of two dominant parties since 1992, alternating power roughly every 8 years with NPP, suggesting structural durability but not guaranteed continuity. Yes
6 STRONG 92 ↑ UP web_search + wikipedia_lookup NPP suffered a catastrophic defeat in 2024, dropping from 137 parliamentary seats to just 88 — a loss of 49 seats — leaving them severely weakened as an opposition force heading into 2028. Yes
7 STRONG 88 ↑ UP wikipedia_lookup NPP presidential candidate Bawumia conceded quickly after the 2024 election, and NPP lost both the presidency and parliament simultaneously — a comprehensive defeat requiring significant rebuilding. Yes
8 MODERATE 75 ↓ DOWN code_execution Historical pattern shows NPP has previously rebuilt from defeats (e.g., 2000, 2008), suggesting 4 years may be sufficient for a competitive comeback, as Ghana has seen complete swings in a single election cycle. Yes
9 MODERATE 58 ↑ UP kalshi_data Kalshi market prices Mahamudu Bawumia (likely NPP 2028 presidential candidate) at only 16% probability of winning the 2028 presidential election, implying market consensus that NPP remains weak. Yes
10 STRONG 88 ↑ UP web_search John Mahama won the 2024 presidential election with 57% of the vote alongside the parliamentary landslide — the presidential and parliamentary results were highly correlated, suggesting coattail effects are strong in Ghana. Yes
11 STRONG 85 ↑ UP code_execution In Ghana's electoral history since 2000, parliamentary and presidential results have consistently aligned — the party winning the presidency also won the parliamentary majority in every election, making joint incumbency a meaningful predictor. No
12 STRONG 85 ↓ DOWN code_execution However, incumbents have lost re-election in Ghana in 4 of 7 elections since 2000 (57.1% loss rate), including Mahama himself losing in 2016 — economic performance under incumbency is a key swing factor. Yes
13 MODERATE 62 ↑ UP kalshi_data Kalshi market prices NDC winning the 2028 parliamentary election at 57%, reflecting modest but meaningful incumbency advantage above the historical base rate of ~43%. Yes
14 STRONG 90 ↑ UP web_search + wikipedia_lookup In the 2024 election, independent candidates won only 4 of 276 seats, confirming continued two-party dominance with no third-party breakthrough. Yes
15 STRONG 88 ↑ UP wikipedia_lookup Ghana's NDC-NPP two-party system has been structurally entrenched since 1992, with no third party ever winning more than a handful of parliamentary seats in any election. Yes
Information Gaps
  • No data on Ghana's economic performance under Mahama's 2025-2026 governance — GDP growth, inflation, and IMF program compliance would be key indicators of NDC's 2028 prospects
  • No information on NPP leadership succession/renewal process post-2024 defeat — whether a new, credible NPP leader emerges by 2027 could significantly affect competitiveness
  • No polling data or approval ratings for Mahama/NDC government in 2025-2026
  • No data on Ghana's debt restructuring progress under the IMF Extended Credit Facility — this is likely the single largest economic risk factor
  • No information on by-elections beyond Ablekuma North (July 2025) that could signal mid-term shifts in support
  • No data on cocoa and gold commodity price trends affecting Ghana's fiscal position 2025-2028
  • No data on NDC internal cohesion or potential factional splits that could weaken 2028 performance
  • Voter turnout dynamics: 2024 saw a sharp drop to 60.9% from 79% in 2020 — understanding which party benefits from differential turnout in 2028 is unknown
Key Uncertainties
  • Ghana's economic trajectory 2025-2028: Mahama's first presidency (2012-2016) ended with economic crisis and electoral defeat — history could repeat if IMF austerity generates backlash
  • NPP leadership renewal: Whether NPP finds a compelling new leader by 2028 is the primary swing factor for NPP competitiveness
  • Commodity price shocks: Ghana's fiscal health is heavily dependent on cocoa, gold, and oil prices — an external shock could rapidly shift voter preferences
  • Whether NDC can avoid the incumbency trap that historically sees Ghanaian voters punish governing parties within two terms
  • Mahama's constitutional eligibility: As a two-term president, Mahama cannot run again in 2028 — NDC will need a new presidential candidate, which may affect coattail effects for parliament
Market Context
Price: 0.57 · 7d: -0.02 · 30d: +0.06
Volume: LOW-MODERATE · Depth: SHALLOW
Reliability: LOW-MEDIUM — Only 14 days of data, average 726 contracts/day on a niche African election market; price range of 49-60% suggests meaningful uncertainty but thin liquidity limits reliability. 30-day upward trend (+6%) may reflect growing market recognition of NDC strength.
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 53% (42% confidence)
base rate
50%
40% conf
evidence driven
55%
45% conf
contrarian
53%
40% conf
Spread
5pp
Low disagreement
sq1: Will the NDC maintain or grow its current political dominance heading into the 2028 election?
55%
Base rate for incumbents maintaining dominance through to next election in Ghana is ~43%. NDC's 2024 landslide (184/276 seats) and Ablekuma North by-election win push UP by ~15% — they have unprecedented breadth. However, 'maintaining dominance heading into 2028' is broader than winning — it asks about trajectory. Mahama's previous presidency ended in economic crisis and defeat (2016), pushing DOWN by ~3%. Estimate: 55%.
sq2: Will the NPP be unable to mount a sufficiently competitive challenge by 2028?
45%
Base rate: Ghana shows that defeated parties typically rebuild within one cycle — NPP recovered from 2008 defeat to win 2016, NDC recovered from 2016/2020 to win 2024. So 'unable to mount competitive challenge' has a low base rate (~30%). NPP's catastrophic loss of 49 seats pushes UP by ~15% because the rebuilding burden is unusually large. But 4 years is historically sufficient. Estimate: 45%.
sq3: Will NDC's incumbent advantage translate into a parliamentary majority in 2028?
45%
Base rate: Ghanaian incumbents win re-election only ~43% of the time (3 of 7 since 2000). Strong coattail correlation between presidential and parliamentary results pushes this question's outcome heavily on the presidential race. Mahama cannot run again (term-limited), removing his personal popularity advantage — pushes DOWN by ~5%. NDC's strong organizational position and NPP's weakness push UP by ~7%. Mahama's prior incumbency ending in economic crisis is a cautionary signal. Estimate: 45%.
sq4: Will no third party disrupt NDC-NPP dominance by 2028?
96%
Base rate: Two-party dominance has held for every election since 1992. Independents won only 4/276 seats in 2024. No structural change visible. Estimate: 96%.
Show full reasoning trace
base rate: Ghanaian incumbent parties retain parliamentary majority only ~43% of the time since 2000 (3 of 7 elections). Presidential incumbents lose ~57% of re-election bids. Two-party alternation is the dominant pattern, with each party typically getting 2 terms before swinging.
evidence updates: NDC's 2024 landslide (184 seats, +47) is unusually strong, pushing up from base rate. Ablekuma North by-election win in July 2025 confirms continued momentum. NPP's catastrophic defeat creates a rebuild challenge. However, Mahama is term-limited (cannot run 2028), removing presidential coattails advantage. Mahama's prior presidency (2012-2016) ended in economic crisis — IMF program risk is significant.
combination method: Weighted average across four sub-questions, with downward adjustment because sq4 (two-party dominance) is high-probability but only weakly relevant to NDC specifically winning.
final: Considering NDC's strong starting position counterbalanced by Ghana's historical anti-incumbency tendency, Mahama's term limit, and economic risks, ~50% reflects genuine uncertainty. The strong NDC structural position roughly offsets the historical tendency for incumbents to lose.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.5, 'confidence': 0.4}, 'evidence_driven': {'p_yes': 0.55, 'confidence': 0.45}, 'contrarian': {'p_yes': 0.53, 'confidence': 0.4}}, 'spread': 0.05, 'individual_p_yes': {'base_rate': 0.5, 'evidence_driven': 0.55, 'contrarian': 0.53}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Reasoning Flaw Math Error
Challenges
  1. The combination method is unclear and possibly incoherent. The forecaster lists four sub-questions but doesn't show a clean mathematical combination. Sq3 ('Will NDC's incumbent advantage translate into a parliamentary majority in 2028?') is essentially the resolution question itself, yet it's pegged at 45% while the final answer is 52.7%. If sq3 directly answers the question at 45%, why does the final forecast drift upward? The other sub-questions (sq1, sq2, sq4) are at best loosely correlated with the actual resolution criterion.
  2. Double-counting risk: sq1 (NDC dominance heading into 2028), sq2 (NPP unable to compete), and sq3 (NDC wins majority) are highly correlated — they're essentially three angles on the same underlying question. Treating them as semi-independent inputs and averaging inflates confidence in the central estimate.
  3. Sq4 (no third-party disruption at 96%) is essentially irrelevant to whether NDC specifically wins — it's a near-certainty that doesn't discriminate between NDC and NPP outcomes. Including it in a weighted average artificially pulls the forecast toward 50/50 or higher without informational content. The forecaster acknowledges this ('only weakly relevant') but doesn't correct for it rigorously.
  4. The base rate framing is somewhat misleading: '3 of 7 elections' for incumbent retention is a small sample, and the 2024 NDC landslide is a substantial outlier (184/276 seats is one of the largest majorities in Ghanaian history). The historical anti-incumbency rate may not apply symmetrically when the incumbent starts from such an unusually strong position with a uniquely weak opposition.
  5. With 1,318 days (3.6 years) until resolution, the forecast appropriately reflects high uncertainty, but the confidence of 0.417 combined with a near-50% estimate may understate that the structural NDC advantage is meaningfully larger than a coin flip given current evidence (11 UP vs 3 DOWN signals, all strong UP indicators).
Suggested adjustment: +3pp
Minor upward adjustment warranted because (1) sq4 inclusion artificially dampens the signal from NDC-specific evidence, and (2) the sub-questions are highly correlated, so the evidence weight of sq1/sq2 (both leaning NDC-favorable when properly interpreted) should propagate more strongly. The strong-evidence asymmetry (11 UP, 3 DOWN with multiple STRONG UP signals including landslide, by-election win, NPP collapse, Bawumia at 16%) suggests the central estimate should be modestly above 50%, closer to 55-57%. This is not adjustment toward the market — it's a correction for the diluting effect of including a near-certain but non-discriminating sub-question.
Market comparison: Forecaster: 52.7%, Market: 57%. The 4.3% divergence is small and within the bounds of reasonable disagreement on a long-horizon question. Market liquidity is low so it shouldn't dominate, but the direction of divergence happens to align with the reasoning correction identified above (sq4 dilution). The convergence is coincidental rather than evidence the market is right.
6. Aggregator Opus · final calibrated forecast
56% (40% confidence)
I ACCEPT the critic's challenges 1-3: including sq4 (two-party dominance at 96%) in the weighted average artificially pulled my estimate toward 50/50 without discriminating between NDC and NPP outcomes, and sq1/sq2/sq3 are highly correlated angles on the same question. Correcting for sq4 dilution and weighting the NDC-specific evidence (184/276 seat landslide, Ablekuma North by-election win, NPP collapse with Bawumia polling ~16%) more heavily lifts my estimate to ~0.55-0.57. I PARTIALLY ACCEPT challenge 4 — the 2024 landslide is genuinely an outlier that weakens the symmetric anti-incumbency base rate, but Mahama's term limit and 3.6-year horizon still impose real downside risk. The market at 57% (low liquidity, shallow depth) happens to align with my corrected estimate, so I converge to 0.56 — driven by the methodological correction, not market deference.