What famous economist said that the market economy seemed to be controlled by an invisible hand?

What is the return on a 5 percent coupon bond that initially sells for $1,000 and sells for $900 next year?

A) 5 percent B) 10 percent C) -5 percent D) -10 percent

A decrease in aggregate supply means:

A. Both the real domestic output and the price level would decrease B. The real domestic output would increase and rises in the price level would become smaller C. The real domestic output would decrease and the price level would rise D. Both the real domestic output and rises in the price level would become greater