WHEN A SINGLE PRICE MONOPOLIST MAXIMIZES PROFITS,PRICE IS GREATER THAN MARGINAL COST.IN OTHER WORDS BUYERS ARE WILLING TO PAY MORE FOR ADDITIONAL...

All firms in whatever market structures, want to maximize their profits or minimize their losses.  In all market structures, this is done by producing at the quantity where the marginal revenue gained from selling the last unit produced is the same as its marginal cost (the MR=MC point).  This is the only thing that matters.

So, when a monopoly is producing at that point, it is making the most possible money.  If it produces more, it will start making less profit than it would if it stayed at the MR=MC point.