what are the most likely causes for the discrepancy in predicted outcomes between polymarket and predictit? 

demographics/expertise of participants, market size/liquidity, regulatory constraints for predictit?

@nick @shayne

liquidity - polymarket has orders of magnitude more = better price discovery. predictit has $850 caps so no serious player has incentive to correct their market 

fees - extractive fee schedule on predictit distorts pricing, including a high withdrawal fee, which further diminishes the opportunity for arbitrage