أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Simply expressed - everything today is related to Energy. Oil is the current most common energy source in use.
A long study required to understand the full context - but to get you started check
http://www.investopedia.com/ask/answers/030816/why-are-stocks-and-oil-so-correlated-right-now.asp
