Originally Posted by HarryT
Goods are priced differently for different markets, and many publishers do print cheap editions of books for markets like India and, presumably, Thailand, too. If these "grey imports" were permitted (they have long been ruled to be illegal in the EU) the result would be that the publisher would stop printing these editions, and it would be poor countries that would suffer as a result.
The result would be that publishers would have to lower the prices they charge in rich countries to roughly match the cost of buying abroad, importing and reselling.
It is called free trade.