Determine the top three reasons you're researching the elasticity of the demand for candy bars and write them down. For example, you may want to start selling candy bars and you may be wanting to know which candy bars are in highest demand, or you could be wondering how the demand for candy bars correlates to childhood weight gain. Whatever your reasons are, they will influence what information you gather.
Decide if you will research candy bar demand in general or the demand for specific brands or types of candy bars. Based on this information and the reasons you listed in Step 1, make a list of at least ten different relevant search terms.
Begin your research by accessing databases that focus on economics and/or business and using the search terms you developed in Step 2. You should be searching for articles or reports that will tell you how many candy bars were sold and when. For example, if you have chosen specific brands or types of candy bars, find the sales reports for the last few years.
Compile the data you've gathered into a chart or table, displaying all of the relevant information together for comparison. Use this data to determine the elasticity of the demand for candy bars based upon candy bar sales over a specific period of time. That time frame will be determined by your specific research needs.