Efficiency

Efficiency signifies a peak level of performance that uses the least amount of inputs to achieve the highest amount of output. Efficiency requires reducing the number of unnecessary resources used to produce a given output including personal time and energy. It is a measurable concept that can be determined using the ratio of useful output to total input. It minimizes the waste of resources such as physical materials, energy, and time while accomplishing the desired output.

Equity

Equity represents the value that would be returned to a company's shareholders if all of the assets were liquidated and all of the company's debts were paid off. The calculation of equity is a company's total assets minus its total liabilities, and is used in several key financial ratios such as ROE.