<span>Social darwinism and laissez faire economics were most closely associated with the interests of big business owners. Big business owners had the most to gain from embracing such tactics. With social darwinism and laissez faire these business owners could prevent the government from trying to regulate them and they could take out rival companies and potentially monopolize whichever market they operated in.</span>
They had dosages to do all the work for them
"The cause of" would be the answer
