The demand for new houses in Melbourne and Sydney have held up relatively well, compared to the other states in Australia.

The demand for new houses in Melbourne and Sydney have held up relatively well, compared to the other states in Australia.  However, in Melbourne, it is expected that by the end of this year the increase of new apartments into the market will far outstripped any increase in the demand for new apartments.  Explain, with demand and supply diagrams, the impact on price and quantity for new apartments.