Final answer:
Economists deal with the problem of changing factors in market analysis by using research methods and statistical analysis.
Step-by-step explanation:
When analyzing a market, economists deal with the problem of changing factors by using well-established research methods and statistical analysis. They gather data on various economic factors and track their trends over time to identify patterns and relationships.
By studying these changes and their effects, economists can make informed predictions and recommendations for businesses operating in the market.