How does the congress protect the rights of authors and inventors? why?

Congress protect copyrights and patents to encourage innovation.

 Factors of production are grouped into four categories, which are land, labor, capital and entrepreneurship. Land are natural resources, labor is the work for a paycheck (earns wages), capital denotes physical objects,like  buildings, plants, machinery or non-physical things like human skills,  knowledge and entrepreneurship stands for the ability to organize production, risk taker, ideas... A worker is an example of labor.