Noted French Economist, legislator, and writer Claude Frederic Bastiat is famous for saying, "If goods don’t cross borders, armies will." Nowhere does this appear more true than in the war-torn Middle East, where Israel and its Arab neighbors have been at each other’s throats for over 60 years. 

Here’s an example: In 2012, Egypt, which under its 1979 peace treaty with Israel was required to supply the Jewish state with energy, announced it would suspend the latest 20-year deal, which supplied 40% of Israel’s gas needs.

(Link)