Enlighten me what happens after we get another stock exchange

The first thing is competition. So the commission that the current broker takes might be reduced. People prefer broker that take less commission. And I think competition is required. When there is competition, both broker will try to get more customer in their company. This can be visualized from the movie “Wolf of Wall Street”. You can see how brokers call buyers to buy a stock and call a seller to sell the stock. In summary, traders or investors will get more value from stock market investing.

You can buy and sell in either exchanges….you will need a trading account in both the exchanges…or you can keep trading just on NEPSE