Self-Fulfilling Expectations on Wine, Not on the Economy

A quick follow-up to my post about people’s tendencies to confirm their own expectations…

Given that Republicans bill themselves as the Party of Economic Growth, and that many people seem to believe that billing, why do we generally see slower real GDP per capita growth under Republican administrations?

Put another way… why are expectations about the quality of wine self-fulfilling, but expectations about the economy not self-fulfilling?