Some micro economic theory helps us understand why markets operating in relatively free market conditions are often successful, relative to markets operating in planned economies.
Here we have a basic S/D diagram:
As we see the market is at an equilibrium quantity Q* and Price Q*, this is the natural result of free exchange. The demand for the good in question is derived from the utility (or 'happiness) that people gain from consuming that good, this diagram shows the consumer and producer surplus that is derived from the production of the good in question (the total contribution to the 'greater good').
Due to nature of individuals wanting to maximise their own personal gain ( you want the best value for your money) they will attempt to allocate their resources (money) to producers which make the goods that they want thus there is more contribution to the greater good and society overall is better off.
Lets have a look at what happens when the demand for a good increases in a free market.
Here we see demand shift from Demand 1 -> Demand 2, it has increased.
The result is an expansion of the quantity from Q1 -> Q2, as producers are incentivized to increase by as more people are willing to buy their products which means more profit.
With a price increase from P1 -> P2 acting as a rationing mechanism to prevent waiting times or queues for the products or to simply prevent there being too many customers relative to the amount of stock, for example imagine you are running a lemonade stall and you have 8 cups of lemonade left to sell but 10 people waiting to be served. It is beneficial to you to raise your price in order to increase profits and as a result depending on the customers marginal propensity to consumer your product, certain customers are dissuaded from the product due to the higher prices, so two leave and the product has been rationed.
In a planned economy the government controls the allocation of resources instead of it being left to the market mechanisms described above, it is very hard for central planners to estimate the correct level of demand for a good or service. So often they get it wrong and end up producing too many of a good or not enough, so the surplus generated by the production of the goods is not as large as it would be in a free market and as a result there is less contribution towards the common good.
Examples of failures within planned economies
Waiting lines in the USSR
Stalin's forced collectivisation of agriculture in the Ukraine and the USSR resulted in a massive under supply of grain, resulting in mass starvation in the years 1932-1933.
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