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===Theory of the business===
According to Peter Drucker, business theory refers to the key points and strategies of a company, which are divided into three parts:

1.	The external environment (society, technology, customers, and competition).

2.	The goal of an organization.

3.	Guidelines essential to achieving the mission.

This business theory has four differentiations:

1.	Hypotheses maintain that mission and guidelines must be reality focused. 

2.	Thoughts must have agreement.

3.	The business theory must be notable and interpreted by the members of the organization.
 
4.	Business theory must be continuously analyzed. 

Companies have difficulties when the assumptions of such a theory do not align with reality, Peter Drucker took as an example large retail premises, his goal was that people who wanted to buy in large commercial premises do so, but many consumers rejected commercial premises and preferred retailers (which focus on one or two categories of products and own their own premises) time was essential in shopping instead of profits . 
This theory is classified as an assumption and a discipline, which focused on the elaboration of systematic diagnoses, monitoring and testing of the guidelines that make up the business theory in order to maintain competition.
<ref>{{cite journal |journal=[[Harvard Business Review]] |year=1994 |issue=September–October 1994 |title=The Theory of the Business |author=Drucker, Peter F.}}</ref>