The law of supply is a fundamental principle of economic theory which states that, keeping other factors constant, an increase in sales price results in an increase in quantity supplied.
Some heterodox economists, such as Steve Keen and Dirk Ehnts, dispute the law of supply, arguing that the supply curve for mass-produced goods is often downward-sloping: as production increases, unit prices go down, and conversely, if demand is very low, unit prices go up.
For example, a job paying £20/hr attracts more interest than a job paying £15/hr, and a high interest rate attracts lenders and deters borrowers.
[6] For example, if the costs of production, such as wages, decrease, then the manufacturers can produce more goods for the same price, so the quantity supplied will increase.
For some products, such as in agriculture, the quantity supplied is dependent on the weather.