Answer: b. people face trade-offs
Explanation:
From the question, we are informed that Bullie Jean has $120 to spend and wants to buy cither a new amplifier for her guitar or a new mp3 player to listen to music while working out. 
We are further informed that the amplifier and the mp3 player cost $120, each and so she can only buy one. This shows that people face trade offs and have to make a choice regarding some decisions. Here, an opportunity cost will be the one that she didn't buy at the expense of the other. 
 
        
             
        
        
        
Answer: more; externality; market power.
Explanation:
Bakers are much (more) likely to supply pastries to the market if property rights are not enforced.
a. A manufacturing plant dumps chemical waste into a nearby river, poisoning the water supply for a small town downstream. - Externality
Externality, refers to the benefit s or costs that someone else incurs based on the economic decision of another person. In this case, this is a negative externality as the small town bears the cost of the production activities of the company. 
b. A single public utilities company is responsible for supplying electricity for an entire state. As a result, the utilities company can set the price of electricity - Market power
Market power is when a firm is able to dictate the price and can then raise the price. This brings about the reduction in output as well. Since the single public utilities company is responsible for supplying electricity for an entire state, the company is enjoying monopoly power or market power.
 
        
             
        
        
        
Answer:
The answer is: remain the same
Explanation:
The marginal utility of a good or service is how much better we feel when consuming an extra unit of that good or service. For example if we are very thirsty, the marginal utility of consuming a can of Coke is very large, but once our thirst is quenched, an extra can of Coke will not provide use with that much satisfaction as before. 
If the price of a substitute good increases, the marginal utility of the good whose price didn't change, will remain the same. 
Let's go back to the Coke example. An extra can of Coke will give me 5 more satisfaction units (I'm assuming I can measure satisfaction) and an extra slice of pizza will give me 7 more units of satisfaction. If the price of Coke increases from 50 cents to $1, its marginal utility will decrease. I will buy more pizza because the satisfaction I get from drinking Coke is now smaller. 
 
        
             
        
        
        
Isabella takes $100 of currency from her wallet and deposits it into her checking account. If the banks add the entire $100 to reserves, the money supply increases, but if the bank lends out some of the $100, the money supply decreases.
        
             
        
        
        
Xyz company is a low-cost provider. Xyz is most susceptible to ANY NEW INNOVATIONS OR INVENTIONS FROM A COMPETITOR COMPANIES. 
Low cost strategy is one of the three generic marketing strategies. It is a pricing strategy in which a service provider or a company reduces the cost to increase profit and demand.