3. In addition to price, the demand for a product is influenced by the

(a) level of consumer income,

(b) distribution of income among consumers,

(c) price of related products (substitutes and complements),

(d) preferences of consumers,

(e) population in the market area, and

(f) consumer expectations about the future price of the product.
Changes in any of these six factors will cause the demand for the product to change (the entire curve to shift).