According to President Reagan's miles for supply side economics the first step to triggering a cycle growth was

The correct answer is reducing taxes.

Reaganomics, which is based on supply side economics, focuses on first cutting taxes. Reagan believes that cutting taxes allows businesses to have more money. With this money, businesses can hire more workers, fund innovative projects, etc. Based on this belief, the idea of supply side economics would result in all members of a corporate structure benefiting from massive tax cuts and deregulation of business.

According to President Reagan's miles for supply side economics the first step to triggering a cycle growth was reducing taxes.