What was the open door policy intended to do?

He seventeenth amendment to the us constitution calls for the direct election of all us senators. this means that the people of each state get to vote to decide who will be their two us senators. before this, the legislatures of each state chose the two us senators from that state with no direct involvement of the average voter. why would this amendment be considered a reform? how would it benefit the people? even today some people claim that the seventeenth amendment was a bad idea. what arguments could be made for reverting selection of us senators back to the state legislatures?

In an industry in which there are several providers of a type of good, why can one business not charge much higher prices for their goods?

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?