Why is bargaining and persuasion essential to the success of the POTUS?

This is an ap world history question. i am working on a worksheet which has a vent diagram with each circle labeled either us or byzantine economy. the middle is the similarities. can someone explain to me the similarities and especially the differences between the two?

The larger the investment you make, the easier it will be to question options: get money from other sources. guarantee cash flow. buy insurance. streamline your products.

A(n) provides the opportunity to hear the views of various experts, other public officials, supporters and even opponents of a bill. ordering