This is how I would write it with minor corrections..
The production of counterfeit is rising. Top brand names are being reproduced illegally all over the world and billions of dollars are being lost each year in tax revenue. This black market, in fact, represents 5% of the world's trade. Frequently counterfeit goods are bought by people who think they are original products. Those suspecting they aren't, buy them because of the price. Fake perfume, for instance, can be bought at a quarter of the price of the original one. Top companies are complaining that their reputations are damaged by inferior products, and although new anti-counterfeiting laws have been introduced in Europe, situation has not improved. This is partly because production of counterfeit goods are organized by some of the most sophisticated criminal organization in the world.