When the demanded goods quantity is equal to the supplied goods quantity, the market is in a state of equilibrium. This means that the quantity of goods consumers want to buy matches exactly the quantity producers are willing to sell at a certain price.

• If the quantity demanded equals the quantity supplied, there is neither a shortage nor a surplus.
• Shortage occurs when demand exceeds supply.
• Surplus occurs when supply exceeds demand.

Therefore, the correct answer to the question "When the demanded goods quality is equal to supplied good's quantity, then____" is: d. none of these This is because the state described is market equilibrium, which is not represented by options a (shortage), b (surplus), or c (government investing) in the given choices.