Music compact discs are normal goods. What will happen to the equilibrium price and quantity of music compact discs if musicians accept lower royalties, compact disc players become cheaper, more firms start producing music compact discs, and music lovers experience an increase in income?

Quantity will rise, and the effect on price is ambiguous.

Explanation:

Music compact discs are normal goods. There is a positive relationship between the demand for the normal goods and the income of the consumers.                                                              

If the compact disc players become cheaper to produce then as a result all the producers start producing music compact discs and this will increase the supply of music compact disc. This will shift the supply curve rightwards.

And if the income of the music lovers increases then as a result the demand for music compact discs increases. This will shift the demand curve rightwards.

Therefore, these changes will increase the equilibrium quantity and the impact on equilibrium price is ambiguous because that will be dependent upon the magnitude of the shift of supply and demand curve.