Early in his career, adler used which term to refer to the single force behind all human motivation?

How do i use this to get the right answer

What is a person called when they are on your side and supports you

How has the elimination of trade barriers affected the movement of goods among member countries of the european union? a. member countries are able to produce all the goods they need. b. goods can move freely among member countries. c. member countries no longer need to trade with countries outside the eu. d. larger countries are able to import more goods than smaller ones.