Milton friedman led a new economic school of thought called
a) laissez faire.
b) monetarism.
c) price signaling.
d) the invisible hand.

The second alternative is correct (B).

Milton Friedman was the most famous liberal economist of the 20th century, winning the Nobel Prize in Economic Sciences in 1976. He is the author of the famous phrase: there is no free lunch.

Friedaman is considered the father of monetary theory. Studying the American economy, Friedman concluded that the money supply affects short-term production and long-term prices. This is because, in analyzing the role of money in economic cycles, he found that fluctuations in money growth preceded fluctuations in output growth.

Therefore, one of Friedman's greatest contributions was to point out that monetary policy would play a valuable role in the conduct of the economy.

- a.) african slaves and indentured servant’s

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the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.