Privately held business do not have readily available trading prices. to offset problems with diversification caused by private held business assets investors can the in their investment portfolios for securities.

d. positive supply shock that shifts AD to the right.

Explanation:

An increase in producer confidence should increase the short run aggregate supply (it is positive, so total supply increases). That rightward shift in the supply curve will also result in a rightward shift of the aggregate demand curve. As production increases, more workers are hired and unemployment false, which increases household income and demand.