In perfectly competitive markets, firms in the market in the long-run, will earn zero economic profits.
<h3>What economic profits are earned in a perfectly competitive market?</h3>
In the short-run, there is a chance to earn a positive economic profit in a perfectly competitive market but this would then attract other companies into the market to make profits as well.
This then leads to the profits disappearing thanks to increased supply and lower prices. Companies would then leave and enter to either take advantage of profits or stop losses thereby keeping economic profits at zero in the long run.
Find out more on perfectly competitive markets at brainly.com/question/15712381
#SPJ1
The number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.
<h3>What is a resistor?</h3>
In an electronic circuit, a resistor is an electrical component that limits or regulates the flow of electrical current.
Given, the resistance is 20 ohms.
The potential difference is 30 volts
Time is 10 minute
By the formula of current

The charge flowing through the resistor is 1.5 C/s
1 electron charge is 1.6e+19
Now, the number of electrons passing through a 20 ohms resistor is

In 10 minutes

Thus, the number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.
Learn more about a resistor
brainly.com/question/24297401
#SPJ1