Final answer:
True, Keynes argued that the overall level of employment is determined by the level of aggregate demand, and the government should ensure it is sufficient to achieve full employment without directly managing prices, wages, or businesses.
Step-by-step explanation:
According to John Maynard Keynes, the overall level of employment is indeed determined by the level of aggregate demand for goods and services. This concept is a hallmark of Keynesian economics, which emphasizes that aggregate demand influences the actual production and employment levels within an economy. When aggregate demand falls short, it may result in unemployment since there is not enough demand to employ all willing workers. Keynes believed that the government should play a role in ensuring that aggregate demand is sufficient to achieve full employment, but this does not mean that the government should control prices and wages or manage businesses directly.