The rest of it will be: price equals marginal cost. But this indeed is not true. The most accepted idea is that for a monopolistically competitive firm the average revenue and price are the same quantity. Now, when a monopolistically competitive firm is in long-run equilibrium, then the marginal revenue is equal to marginal cost. 
        
             
        
        
        
Answer:
20 more tons of pollution into the air, and Firm B will emit 100 fewer tons of pollution into the air.
Explanation:
It is given that :
Amount of tons of pollutants emitted by the two firms A and B earlier = 100 tons
Cost of pollutants by firm A = $ 200 per ton of pollutions
Cost of pollutants by firm B = $ 100 per ton of pollutions
Since the cost for eliminating the pollutants into the air is more for the firm A, the ticket is also more valuable for firm A. And therefore, firm A will buy all the tickets form firm B for an amount around $ 101 to $ 199. It will do so as to have a positive consumer and also to produce surplus.
So firm A will eliminate 20 tons of pollution and will use 80 ton capacity from the tickets. And for firm B, it will eliminate all 100 tons of pollutions.
 
        
             
        
        
        
Answer:
Motion. 
Explanation:
Motion can be defined as a change in location with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement etc. 
 
        
             
        
        
        
Volunteers serving alcohol at a special event must 
1) firstly, volunteers must be of legal age to serve alcohol at any event.
2) Volunteers must abide by all the rules and laws for alcoholic beverages in the state where an event will take place, for example, some states or cities may require the volunteer to get a one time permit to serve alcohol.
3) Volunteers must recognize signs of intoxication and professionally refuse or give any more alcohol to intoxicated persons.
4) Volunteers must observe the ages of the guest. It might be hard to ask guests for their ID, however, if in doubt request for ID before serving alcohol, and if in trouble, reach out to management, or your superior.
5) importantly, Volunteers must not serve alcohol to minors because this might land you in jail.
 
        
             
        
        
        
Answer:
The correct answer is the circular flow model. 
Explanation:
The circular flow model shows the movement of resources between different sectors in the economy. The firms or business hire factors of production from the households. In return, they make factor payments. They use these factors to produce goods and services. The households purchase these goods and services and pay by their factor incomes.  
The government sector charges taxes from households and businesses and provides goods and services in return. The government also hires factors of production and make factor payments. It also purchases goods and services from the businesses and pays for it.