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B in Demand
a change in the number of buyers
I in Demand
a change in income
T in demand
a change in consumer taste and preferences
E in Demand
A change in the expectation of a future price
P in demand
a change in the price of a related good (substitute or complement)
T in Supply
Business taxes, regulations, or subsidies
I in supply
a change in resource or input prices
G in supply
a change in gadgets/technology
E in supply
a change in the future expectations of sellers
R in Supply
a change in the price of related goods
S in supply
a change in the number of suppliers