Determinants of Demand are non-price factors causing demand shifts. Main determinants: Consumer income (higher income increases demand for normal goods, decreases for inferior goods), Prices of related goods (complementary goods like bikes-petrol show inverse relationship; substitute goods like tea-coffee show direct relationship), Consumer preferences (advertising, fashion, technology changes), Number of consumers (population growth increases market demand), Expectations (anticipated income/price changes shift current demand), Tastes (cultural shifts). Graphically: Shift of entire demand curve right (increase) or left (decrease), not movement along curve. Income classification: Normal goods (demand increases with income), Inferior goods (demand decreases with income—example: lower-quality food when income rises). Related goods: Complementary (bought together), Substitute (replace each other). Indian context: Monsoon affects agricultural demand; smartphone demand increased with income growth. ICAI distinction: Price changes = movement; determinant changes = shift. Exam tip: Questions about "shift" always involve determinants, not price.