Legal Influences on Economic Concentration

Respond to the following in a minimum of 175 words:

Innovation and physical capital are 2 of the 4 factors of production. Discuss some specific ways that 1 of the following laws increased the productivity of 1 or both of these factors of production:
1862 Pacific Railway Act
1956 Federal Aid Highway Act
1946 Federal Airport Act
What other examples of economic concentration can you share?
What are the risks and advantages to economic concentration?
How has economic concentration influenced your industry?