What do business owners use to gather information for market demand schedules? income effect marginal utility market research substitution effect

## Step 1<br />The question is asking about the method business owners use to gather information for market demand schedules. Market demand schedules are a representation of the quantity of a good or service that consumers are willing and able to purchase at different price levels.<br /><br />## Step 2<br />The options provided are income effect, marginal utility, market research, and substitution effect. These are all economic concepts, but they are not directly related to the gathering of information for market demand schedules.<br /><br />## Step 3<br />The income effect and substitution effect are related to consumer behavior and how changes in income or the price of goods can affect the quantity demanded. Marginal utility is a concept that describes the additional satisfaction a consumer gets from consuming one more unit of a good or service.<br /><br />## Step 4<br />Market research, on the other hand, is a systematic process of gathering, analyzing, and interpreting information about a market, including information about potential and existing customers and competitors. This is the method that business owners would use to gather information for market demand schedules.