Efficiency and Effectiveness - Efficiency is often confused with effectiveness. - Efficiency is quantitatively determined by the ratio of useful output to total useful input. - Effectiveness is the ability to achieve a desired result. - Efficiency can be expressed as a percentage of the ideal result. - Efficiency can be indirectly quantified with a non-percentage value.

Inefficiency - Inefficiency is the absence of efficiency. - Allocative inefficiency refers to a mismatch between resource distribution and consumer preferences. - Distributive inefficiency refers to the inefficient distribution of income and wealth. - Economic inefficiency means a better job could be done at a lower cost. - Keynesian inefficiency is caused by inadequate aggregate demand.

Types of Inefficiency - Pareto inefficiency occurs when improving one person's situation worsens someone else's. - Productive inefficiency means the given output could be produced at a lower cost. - Resource-market inefficiency refers to barriers preventing full adjustment of resource markets. - X-inefficiency relates to inefficiency in organizing people or production processes. - Inefficiencies can be analyzed using data envelopment analysis.

Mathematical Expression - Efficiency is often measured as the ratio of useful output to total input. - It can be expressed as a mathematical formula. - Efficiency is limited by the conservation of energy. - Business efficiency is measured by comparing revenues to expenses. - The Efficiency Movement advocated for efficiency in various aspects of society.

Efficiency in Other Sciences - Algorithmic efficiency optimizes the speed and memory requirements of computer programs. - Efficiency is a non-functional requirement in systems design and architecture. - Efficiency factor is relevant in data communications. - Storage efficiency measures the effectiveness of compute. - Efficiency is a concept applicable in various scientific disciplines.