Portuguese wines and the relationship quality-price

"The quality of Portuguese wines is extraordinary," says Gary Vaynerchuk.
For the largest online retailer of wine, owner of Wine libray, Portugal is the dominant country in the relationship quality-price in red wines.
Gary says he cannot understand how Portugal can produce and sell such good wine for only 5 euros.

More about Gary Vaynerchuk
Website: http://garyvaynerchuk.com
Wine Library: https://winelibrary.com
Wikipedia: http://tiny.cc/wineGuy