The technology so many of us use for work and daily tasks is often so reliable that it comes as almost a shock when a service or tool isn’t working. But whether due to cyberattacks, natural disasters ...

Alice Zhang is an Editor with Investopedia. She works on stories about business and impact investing. She is a Certified VITA Advanced Tax Preparer. Andy Smith is a Certified Financial Planner (CFP®), ...

Data envelopment analysis (DEA) is a methodology that allows, in one way or other, the assignment of efficiency scores to members of a group of decision-making units. We call an efficiency measure ...