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There is a difference between a 'need' and a 'want'. Want is always on the lighter side of a human being. Though the business from 'needs' is always greater than business from 'wants', it is easy to sell 'wants' if you look at from a perspective. in this background, it is easy to sell food and beverage, cosmetics and so on with a good marketing support as competition is out there everywhere.
Food and sport related products
I have other answers from the above , but we can say in the question not only products in order to answer right i think (( Communications )) as its the most valueable these days with less cost and huge margin.
TUFF QUESTION........... IF YOU ALLOW ME TO TELL THE TRUTH..... OLDEST BUSINESS ON EARTH,,,,,
Bottle of water .its in high demand in the middle east ,these days
i believe solutions. the best things you can sell is solutions to problems every country has,.
even though it isn't a product,still it is in great demand.
Electronic items