The first few contests in the Democratic presidential primary race have been fought in states that are small and somewhat quirky economically. There aren’t many states where voters care as much about ethanol subsidies as they do in Iowa, or where culinary unions wield as much power as in Nevada.

All of that will change on Super Tuesday. The 14 states voting make up nearly 40 percent of the population, and an even larger share of gross domestic product, with all the demographic and economic diversity those numbers suggest.

Tuesday’s results, therefore, could give us our first hard data on how the economy is affecting the Democratic race. Senator Bernie Sanders of Vermont has moved to the front of the pack by emphasizing his plans to tackle income inequality — will that message resonate more in places where more families are struggling? Michael R. Bloomberg, the billionaire former New York City mayor, has stressed his management experience — will that play better in wealthier, more highly educated places?

Fourteen states are a lot to keep track of. So we’ve broken them into four categories based on their long-term economic strength (represented in the chart above by their median household income) and their more recent performance (their job growth since the start of the Trump administration).