If PRICE of any commodity increases then called as EXPANSION and If PRICE OF RELATED COMMODITY increase then EXPANSION or INCREASE ?????
Difference between change quantity demand and change in demand
One is movement along the curve and another is shift of the curve. If there is a change in Qty demanded there will be a change in price i.e movement along the curve. Change in demand is when there is a shift in curve i.e at same price point qty demanded is now more that what it was earlier or less than what it was earlier