Price - As price increases the demand will decrease
Price of substitutes - a substitute product is an alternative, if a customer cannot afford they will find a cheaper option
Marketing - marketing can stimulate demand, e.g promotions can help encourage sales, marketing can drive demand to a website
Alternative brands - if an alternative brand is available and the original product is not available then this will affect demand, and customers will buy an alternative brand
Price of complements - a complementary product needs to be used with another product, as the price of complements rise demand for products falls
Changes in consumer income - as consumer incomes rise the demand for some products that are cheap or unhealthy less expensive items fall. Although, as consumer disposable incomes rise they have more money to spend on products
Population structure and demographics - as population trends and social norms change so do the demands for certain products and services
Time of the year - seasonal holidays and weather affect demand i.e. back to school, Christmas, Halloween, summer
External shocks - world events such as terrorist attacks, pandemics, natural disasters effect consumer demand