Identify four examples of forces that have been influential in changing the nature of the construction industry. Provide examples of each and explain their impact in detail.

Identify four examples of forces that have been influential in changing the nature of the construction industry. Provide examples of each and explain their impact in detail. 

Your response should be at least 200 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.