The law of variable proportions shows a particular pattern of changes in output and is an explanation of short run production function where some factors remain unchanged. In the history of economics till the time of Alfred Marshall, there were three laws of return, increasing, constant and diminishing laws of return. Much time was wasted in this issue. However, it was later on realized that there are three stages of production
The law is also known as the law of increasing costs. It is one of the important laws of microeconomics. The law of diminishing return indicates that if the number of variable inputs is increased with some fixed inputs, the total output will first increase but then start to decline. It is the third stage of the law of variable proportions. The law is applicable both in agricultural and industrial sectors.