The three questions of economics best help in making decisions about

The three questions in economics help make the best decisions by; the questions give us simple questions, with each question answered, it allows us to find out what is the most efficient and beneficiary to everyone within the nation where the economic questions are being held, it allows us to distribute products to certain people, in the most efficient manner possible and allows us to do it while making enough profit to continue to make more for other groups.

peace keepers

idealism to be spread

riches kept

this isn't a question and if you're going to list things be kind and use commas.