Eli Whitney's invention of the cotton gin, in the long run, caused consumer surplus in the market for slave labor to Naim 14:27 Economics Eli Whitney's invention of the cotton gin, in the long run, caused consumer surplus in the market for slave labor to a.) change uncertainly. b.) not change. c.) increase. d.) decrease. Answer: a Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+