Alarge new diamond mine has just opened and the price of diamonds has gone down since she has study economics is cecilia decides to buy diamond necklace and she knows that

The answer is:

In this case, Cecilia only decides to buy the necklace, knowing that the cost of  diamonds depends only on the demand.

She will find a good price, because she knows the product availibility exceeds the demands, making the prices go low!  when people start looking for this kind of diamond, the reverse will happen. The demands will exceed availability and prices will rise. Cecilia takes advantage of the fact that demand is low.

is this supposed to be a question

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.