Margin trading system and types of Stock Exchanges

Know that there are a lot of goods are sold and purchased between people, institutions and countries such as Stocks and bonds. Basic goods. Currency.

and you know that the market for each commodity sector. Where he will meet those interested in this item and share sale and purchase.Where the price of the commodity is determined on the basis of the law of supply and demand. these markets are called stock exchanges.

Stock exchanges exist in all countries of the world and each stock exchange have its specialization.

Stock exchanges has two types:

1- Stock Exchanges of direct exchange.

2- Stock Exchanges over the counter (OTC)

what is the different between the two types ?

Stock exchanges of direct exchange Have a central place to be specified for those who want to deal in it. to go to it to sell or buy ,or through the presence of a representative to the buying and selling in his name. such as . New York Stock Exchange . London Stock Exchange .

Stock Exchanges over the counter (OTC) Is the market where buying and selling without having a central location specific. But through communication networks and computer.