Upward Movement' alongwith same Supply Curve indicates :

Question

Accepted Answer

The correct option is 2:
The term 'Upward Movement' along the *same* Supply Curve is a key concept in the Law of Supply, which states that as the price of a commodity increases, its quantity supplied also increases, *ceteris paribus* (all other factors remaining constant). This direct, positive relationship between price and quantity supplied is illustrated by the upward-sloping supply curve. When the price rises, producers are motivated by the higher profit margins to offer more of the product in the market. This movement from a lower point to a higher point on the existing curve, signifying an increase in quantity supplied due *only* to a price rise, is technically known as the **Expansion of Supply** or *Extension of Supply*.

The incorrect option is 1:
**Contraction of Supply** is the exact opposite of expansion. It is represented by a *downward movement* along the *same* supply curve. This movement is exclusively caused by a *fall* in the commodity's own price, leading to a reduction in the quantity supplied by producers. Since the question specifies an *upward* movement, which means an increase in price and quantity supplied, the term contraction is incorrect.

The incorrect option is 3:
**Increase in Supply** refers to an entirely different market phenomenon. It is represented by a **rightward shift** of the *entire* supply curve, meaning producers are willing to supply more quantity *at the same price*. This shift is caused by non-price factors, known as determinants of supply, such as a reduction in production costs, improvement in technology, or the granting of government subsidies. It is a change in 'supply' itself, not just the 'quantity supplied' due to price.

The incorrect option is 4:
**Decrease in Supply** is also a shift in the supply curve, specifically a **leftward shift** of the *entire* curve. This occurs when non-price factors change unfavorably, such as an increase in the cost of raw materials or new taxes on production. It signifies that producers will supply *less* quantity at every price level. Since the question describes a movement *along* the curve due to a price change, a curve *shift* like a decrease in supply is logically incorrect.