The system of mass production in manufacturing developed rapidly after the industrial revolution. during the gilded age. before the industrial revolution. after the gilded age.

During the gilded age

Explanation:

In 1870 and 1880, both the economy as a whole and wages, wealth, national product and capital in the United States grew at the fastest pace in the history of the country. As the industry grew, methods of mass production evolved. The Gilded Age of the second half of the XIX century became the epoch of magnates. The economy quickly evolved, and corporate incomes grew rapidly as well.

i thing that the best option is a.they feared it would cause a second economic collapse.

one of the most negatives aspects of the new deal was that it upset the balanced federal budget and led to a huge deficit for the nation while at the same time failed to end increasing unemployment. roosevelt's program, based on keynesian theories of economics, called for massive government spending to stimulate the economy. as he   failed to do this with large tax increases; large sums of money were borrowed to fund new deal programs. when the economy showed some improvement, roosevelt was concerned about inflation, and ordered cuts in government spending. unfortunately, he did so at a time when the new social security tax had cut people's disposable income. businesses were too afraid of spending, and the economy in 1937 was in worse shape than in 1929. at the end of that year, two million people were unemployed.