World market existed from the basic economics of supply and demand theory where demand is the amount or quantity of goods or services that buyers are willing to pay at certain price in exchange for its value or benefit while supply refers to the quantity of goods or services that suppliers are willing to produce at certain cost. Figure 1 and 2 below explain how demand and supply changes with price. Figure 1 shows an inversely proportional relationship of demand and the price. Demand increase from Q1 to Q2 when price drops from P1 to P2. This explains why post Christmas sales attracts huge crowd to the shopping mall. Figure 2 shows a direct proportional relationship of supply and the price. Supply quantity increase from Q3 to Q4 as the price of goods or services increase from P3 to P4. Supplier tends to produce more at higher selling price as it means higher profit for the supplier. This can be seen in agriculture industries where Malaysia and Indonesia where palm oil production increased significantly when the profit is high.
However, supplier cannot keep producing without limit as price is determined by whether there is demand. When the supply is more than the demand, the price will drop. When demand is more than the supply, the price will increase.
Due to the opposite nature of the demand and supply with respect to price, supply and demand will have to keep re-adjusting itself until a point where supply S is equal to demand D. This is the point where all the demand will be fulfilled by the supply at a optimum price (Peq). This is when market reaches its equilibrium (Fig 3). This is the state where market is most efficient in its resource allocation. In the real world market, the basic supply and demand curve sometimes fails to allocate its scarce resources to the socially
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