The impact of the post-World War II economic boom on suburban development was that it had a great deal to do with causing suburbanization.
In the years after World War II, the US economy boomed. The US was by far the richest country in the world and the one with the strongest economy in these years. It had not been hurt by the war in any serious way and it boomed for a variety of reasons. With the economic boom, Americans became much wealthier than they ever had been before. This helped to bring about the development of the suburbs.
As Americans came back from the war, they had a lot of money to spend and they typically had pretty good jobs. Because of the GI Bill, they were able to go to college in record numbers. This helped them get better jobs. The GI Bill also helped them get loans to buy homes in the suburbs. Since the GI Bill did this, developers began to build suburbs to fill the demand. The masses of new white collar workers in the booming companies filled up the suburbs.
In this way, the economic boom led to a situation in which Americans had the means to buy homes in the suburbs.