The correct answer would be, Assets. 
When an entrepreneur takes some of his profits and replaces old machinery, he is investing in Assets. 
Explanation:
An entrepreneur is a person who initiates a business and runs it to earn profits. He is fully aware of the risk associated with the business in the form of loss, but he puts his efforts to run the business in the hope of earning profits. 
Assets are things which add value to the business. Assets are basically a company's long term, fixed, liquid or current possessions. Assets may include the following:
- Cash
 - Treasury Bills
 - Lands
 - Property
 - Machinery
 - Furniture
 - Savings
 - Inventory, etc
 
So When an entrepreneur takes some of his profits and replaces old machinery with the new one, he is actually adding value to the business, which means he is investing in the assets. 
Learn more about Assets at:
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That is really up to you. What would you add to it? I don't think there is really a right or wrong answer to that. 
        
                    
             
        
        
        
The question is asking to state and complete the said passage in the question which states Because the farmer of the United States constitution were concerned about citizens having to much power, and base on my research, the possible answer is that they established a republic. I hope you are satisfied with my answer 
        
             
        
        
        
Rational decision simply means a decision based on logic. It would be logical to say that people would always prefer more benefits than the cost they will be expending. Rational decisions indeed<span> occur when the marginal benefits of an action equal or exceed the marginal costs. No person would make a decision that would incur a loss in his part. Therefore, in order to say that you were able to have a rational decision, you have to bear in mind the profit you can gain out of it. Example of this is the decision on additional worker. Suppose you are paying $20</span><span> per worker and they produce 5,000 units. If you are to add additional worker, you will incur an additional $20 but it will also increase the production output to 8,000 units. Therefore, it would be a rational decision to employ another worker since the benefits would exceed the cost.</span>