# How Efficiency Is Measured

> **Definition**
>
> Efficiency levels are calculated by dividing total output by total input.

## What Is Efficiency?

Efficiency means that an entity is operating at an optimum level of performance. It is a measurable concept that can be determined by the ratio of useful output to total input. A company that maximizes efficiency effectively employs resources such as raw materials, labor hours, energy, and time.  

### Key Takeaways

*   Higher efficiency occurs when unnecessary or redundant resources are reduced during the production of goods or services.
*   Efficiency types include economic efficiency, market efficiency, and operational efficiency.
*   Investors can measure the efficiency of their investments using the return on investment figure.

![Efficiency: Using the least amount of inputs to achieve the highest amount of output.](https://www.investopedia.com/thmb/8NULGCEEpiLyfr7ULiMw-EhlV-E=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/efficiency.asp-Final-e6a7e97286ac49e1a914471a731c2582.jpg)

*Efficiency directly impacts profitability, productivity, and the overall success of a company. — Yurle Villegas / Investopedia*

## Why Efficiency Is Important

To be efficient, individuals and entities achieve results by optimizing the use of scarce resources. This may include money, [human capital](https://www.investopedia.com/terms/h/humancapital.asp), production equipment, and energy sources. Analyzing efficiency can help reduce costs and increase a company's bottom line.

Corporations can measure the efficiency of a production process, which can reduce costs while increasing output, leading to higher sales and [revenue](https://www.investopedia.com/terms/r/revenue.asp). For example, [artificial intelligence (AI)](https://www.investopedia.com/terms/a/artificial-intelligence-ai.asp) can enhance supply chain management. AI helps companies forecast demand more accurately and plan accurate inventory levels. Data analytics can be applied in an industrial setting to inform factory or plant managers when machinery needs maintenance or replacement.

Consumers can purchase energy-efficient appliances to decrease their energy bills. Investors can determine the efficiency of their investments by using [return on investment (ROI)](https://www.investopedia.com/terms/r/returnoninvestment.asp), which highlights an investment’s return relative to how much it costs.

> **Fast Fact**
>
> Consumer appliances such as refrigerators, washers, and dryers marked with an ENERGY STAR label meet strict energy-efficiency specifications set by the U.S. Environmental Protection Agency.

## Formula

Efficiency is measurable and expressed as a ratio or percentage:

> Efficiency = Output ÷ Input

Output (or work output) is the total amount of useful work completed without accounting for any waste and spoilage. To express efficiency as a percentage, multiply the ratio by 100.

## Types of Efficiency

*   **Economic efficiency**: The optimization of resources to best serve each person in an economy. Indicators may include the number of goods brought to market at the lowest cost using labor that provides the greatest possible output.
*   **Market efficiency**: Markets are efficient when all information is incorporated into prices. There is no way to beat the market since there are no undervalued or overvalued [securities](https://www.investopedia.com/terms/s/security.asp) available. [Market efficiency](https://www.investopedia.com/terms/m/marketefficiency.asp) was formalized in 1970 by economist Eugene Fama, whose [efficient market hypothesis (EMH)](https://www.investopedia.com/terms/e/efficientmarkethypothesis.asp) states that an investor can’t outperform the market. Fama argued that market anomalies should not exist because they will immediately be arbitraged away.
*   **Operational efficiency:** Measures how well profits are earned as a function of operating costs. The greater the [operational efficiency](https://www.investopedia.com/terms/o/operationalefficiency.asp), the more profitable the firm or investment because the entity can generate greater income or returns at the same or lower cost than an alternative.  
    

> **Fast Fact**
>
> In financial markets, operational efficiency occurs when transaction costs and fees are reduced.

## Historical Impact

Advances in efficiency allow greater productivity in less time. Goods that are produced efficiently can be sold at a lower price. Advances in efficiency in home electricity, running water, and transportation have historically facilitated higher [standards of living](https://www.investopedia.com/terms/s/standard-of-living.asp). Breakthroughs in economic efficiency often coincide with the invention of new tools, including the steam engines and motor vehicles that emerged during the [Industrial Revolution](https://www.investopedia.com/terms/i/industrial-revolution.asp).

Many scientists developed practices to optimize specific task performance. One famous example is the novel _Cheaper by the Dozen_ by Frank Bunker Gilbreth Jr. and Ernestine Gilbreth Carey. In the book, systems are presented to maximize efficiency in even the most mundane tasks, such as brushing teeth.

Industry 4.0 is the Fourth Industrial Revolution characterized by digitalization. Factory processes, manufacturing, and service industries are all more efficient, thanks to more powerful computers, [cloud computing](https://www.investopedia.com/terms/c/cloud-computing.asp), the [Internet of Things (IoT)](https://www.investopedia.com/terms/i/internet-things.asp), data analytics, robotics, artificial intelligence (AI), and [machine learning](https://www.investopedia.com/terms/m/machine-learning.asp).  

## What Is Allocative Efficiency?

Allocative efficiency occurs in an efficient market when capital is allocated in the best way possible to benefit each party involved. It is the even distribution of goods and services, financial services, and other key elements to consumers, businesses, and other entities. [Allocative efficiency](https://www.investopedia.com/terms/a/allocationalefficiency.asp) facilitates decision-making and economic growth.

## What Is Peak Efficiency?

Peak efficiency occurs when all capital, resources, and individual participants are properly allocated and fully functional to the best of their ability.

## How Does ROI Measure Efficiency?

An investment’s measure of efficiency is its return on investment (ROI). This is the way investors and financial professionals measure how efficiently an investment makes a profit. This metric compares one investment to another or multiple investments, such as mutual funds that invest in the same asset class. ROI can be expressed as a ratio by dividing an investment’s return by its cost. It can also be expressed as a percentage by multiplying the result by 100.

## The Bottom Line

Businesses that run efficiently reduce their costs and improve their bottom lines. The efficiency formula shows individuals and entities how well their inputs are used when producing output.  

> **Article Sources**
>
> 1.  IBM. "[How Does AI Improve Efficiency?](https://www.ibm.com/think/insights/how-does-ai-improve-efficiency)"
>     
> 2.  Carvalho, Thyago P., et al. “[A Systematic Literature Review of Machine Learning Methods Applied to Predictive Maintenance](https://www.sciencedirect.com/science/article/abs/pii/S0360835219304838).” _Computers & Industrial Engineering_, vol. 137, 2019, p. 106024.
>     
> 3.  U.S Environmental Protection Agency. "[Energy Efficient Products](https://www.energystar.gov/products)."
>     
> 4.  Fama, Eugene F. “[Efficient Capital Markets: A Review of Theory and Empirical Work](https://people.hec.edu/rosu/wp-content/uploads/sites/43/2023/09/Fama-Efficient-capital-markets-1970.pdf).” _The Journal of Finance_, vol. 25, no. 2. 1970, pp. 383–417.
>     
> 5.  Frank B. Gilbreth Jr. and Ernestine Gilbreth Carey. “Cheaper by the Dozen.” HarperCollins, 2005.
>     
> 6.  Elijah, Olakunle, et al. “[An Overview of Internet of Things (IoT) and Data Analytics in Agriculture: Benefits and Challenges](https://www.researchgate.net/publication/325585854_An_Overview_of_Internet_of_Things_IoT_and_Data_Analytics_in_Agriculture_Benefits_and_Challenges).” _IEEE Internet of Things Journal,_ vol. 5, no. 5, 2018, pp. 3758–3773.