The statement " An economist would look for data on past changes in the money supply, and note the resulting changes in the price level " is correct.
Step-by-step explanation:
In the past, the knowledge economist will research price-money ties and observe trends; then analyse data, and establish the theory.
Financial experts analyse the market activity of economists. Their main responsibility includes the compilation and review of economic and socio-economic data, guidance on economic choices for companies and governments and the creation of models for economic predictions.
- Financial political and socio-economic data collection and review. 
 - Surveys and diverse sampling techniques are carried out. 
 - Researching different areas such as governance, economics, employment, electricity, etc. 
 - Using historical information. Market trends analysis.