How did huge industrial trusts develop in industries such as steel oil and banking, what was the effect on the economy?

The huge industrial trusts developed in industries such as steel and oil because there was a lot of competition to make the most profit and to be the best factory. Oil was a huge cooperation because it fueled the trains. Smaller bothersome rival companies would join bigger ones to create a monopoly. Standard oil owned by Rockefeller was a vast power and the word trust came to be generally used to describe any large scale business combination. Steel became a large industry for the fact that it was a strong metal that built the trains and tall sky scrappers. Also steel was used to build the transcontinental rail roads The Bessemer process came about which was a method of making cheap steel. It made the economy a more cut throat environment of dog eat dog and became ruthless. The economy was about power and money and was very greedy. Immigrant workers were employed with very low wages and worked laboriously many hours a day. Their effect on the economy was to create large monopolies, their effects were tremendous.