Counterfeiting and Piracy cost the U.S. economy between $200-$250 billion per year and the world economy approximately $650 billion per year. Nearly every company, in every industry is vulnerable. Counterfeiters and modern-day pirates rip off everything from brake pads to cell phone batteries to golf clubs and even prescription drugs. As Tom Donohue, president and CEO of the U.S. Chamber of Commerce says, "You make it, you create it, and you invent it, and they steal it and fake it." And these products are not just sold on street corners or on the internet. These dangerous and defective products have infiltrated the supply chain and are sold in legitimate retail outlets. It's everyday products bought in everyday stores. Counterfeiting and piracy can no longer be considered just another cost of doing business.

This is to remind others on this site to buy original/genuine items only which will also save you from being scammed

Source: https://www.uschamber.com

      I agree your frustration. but after this Globalisation,products will move from one corner of the world to the another corner to a another nation at very fast speed..Mode of transport is  also very cheap and quick:

     

      So it is not possible to control duplicates and price difference for all the products: Even though there is intellectual property rights and etc regulations we find people are making duplciates and marketing withour fear:

Replying to [Tell me why]: Very good point and useful post. Counterfeit products cause many problems. They make it hard on the honest traders who have to compete in price with those selling the fakes. The phony batteries may even explode. Phony health care items are real scary.