How did both the townspeople and monarchs benefit from their mutual support

In the feudalism, monarchs and townspeople established a kind of alliance which benefited both. On the one hand, townspeople were allowed to trade and established business inside the kingdom. The monarchy warranted suitable conditions for the traders, which resulted in increased business and therefore an increase in the quality of life for townspeople. On the other hand, monarchs earned financial aids from the townspeople through taxes. Moreover, trough these actions the monarchy achieved more loyalty and increased control over its domains.    

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

by creating a labor shortage that pushed the continent toward a market economy