How are decisions and the decision processes for business markets similar to those of consumer markets?

The question needs to be narrowed a bit. A distinction must be made to differentiate between the meaning of business decisions and decision processes. All business decisions are made through a formal or informal decision making process. Since the primary objective of a business is to maximize profitability, the decision process as it relates to that objective would be to assess the decision options and associated risks.

The decisions and decision processes of consumers, on the other hand, can also be defined in economic term. I am assuming that the question relates to consumer purchase decisions based on product utility received by the consumer and price paid by the consumer. The consumer would normally go through a purchase evaluation process to determine if the product price justifies the utility that the consumer will enjoy.

In this context, there is some similarity between business and consumer market decision making processes in terms of the economic benefit to be gained by the decision makers: profit maximization for a business and product utility maximization for a consumer. Both types of decisions involve risks and opportunity costs for both business and consumers.