i have to respond to a discussion about regression. can you help me provide a responsible yet simple and straightforward reply to the following post:

In mortgage banking, the volume of loans that we receive in the door are all based on our marketing strategies, market rate and our turnaround times (the amount of time it takes us to underwriter the submission and provide a decision). It is easy to see how these factors influence our volume. When the volumes increase the company generates higher revenue. A regression equation that would be representative of this process would reflect the relationship between market rates and volumes. The lower that the markets rates go, the more people purchase houses. Residuals represent the differences that are observed that go against the actual or predicted outcomes. In my example, this may represent reduced market rates in lower income areas where people may not be interested in purchasing homes.