Production costs: how much a good costs to be produced. Production costs are the cost of the inputs, primarily labor, capital, energy and materials. Production costs depend on the technology used in production, and/or technological advances. See: Productivity
Firms' expectations about future prices
Number of suppliers
The determinants of demand are:
Income.
Tastes & preferences.
Prices of related goods and services.
Consumers' expectations about future prices and incomes that can be checked.