For what reson did john sturat mill beleive the government should get involved in the econmony

John Mill believed the government should get involved in the economy because it was important to "stimulate" the economy with government spending, since private industry was not doing enough on its own. 

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.