Is flock an abstract noun

The majority of the republican party during the reconstruction was called:

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.

Why is it necessary to obey social norms? write briefly.