Fun Video: What are the Costs? - (Fixed, Variable, Total, Average and Marginal Costs) Video Lecture | Microeconomics- Interaction between individual buyer-seller

Adriene: Welcome to Crash Course Economics,
I’m Adriene Hill
Jacob: and I’m Jacob Clifford, and I have
a confession. Economists’ perfect little
models don’t exactly reflect real life.
Which is disappointing.
Adriene: Don’t worry. You’re not wasting your time.
Microeconomics explains ideas and concepts in
pretty broad terms, and leaves the business
specifics to other courses like accounting,
management, and marketing. Understanding
economics can help entrepreneurs become better
decision makers. Think of it like a liberal
arts education — it's not where you go to
learn any specific job — but it can help
you see the big picture.
[Theme Music]
Jacob: Let’s say a lawyer stops practicing
law and decides to open up a pizza parlor.
Let’s say his total revenue from selling
pizza is $50,000 and he has to pay $20,000
to cover stuff like the ingredients, the oven,
rent, and wages. Now, an accountant would
calculate his profit, the revenue minus the
costs, as $30,000. Not bad.
But an economist recognizes that there‘s
a cost missing: the opportunity cost. Our
pizza entrepreneur loses the income he would
have earned by being a lawyer, let’s say
$100,000. If you factor that in, he is actually
losing $70,000.
But he's his own boss. He might be happier
running a pizza shop even though he is making
less money. Well, maybe, but the point is,
you have to factor in these implicit benefits
and costs when you make decisions.
So there's actually two types of profit. Accounting
profit, which is revenue minus just explicit
costs, those traditional out-of-pocket costs
you think of when you run a business. And
there’s Economic profit which is revenue
minus explicit and implicit costs — which
is those indirect opportunity costs.
Adriene: In this example, putting a dollar
price on opportunity cost is pretty easy.
It’s just the income he’s not earning
as a lawyer. Maybe the idea of putting a price
on intangible implicit things seems a little
strange, but you do it all the time. When
you’re deciding whether or not to get a
job you calculate the explicit costs — like
how much it costs to get to work every day,
but also the implicit costs — the value
of the things you have to give up.
Maybe you’re giving up the money you could
earn doing some other job, time with family
and friends, or the opportunity to binge watch
Gilmore Girls. How much that actually costs depends
on the individual, but if the wage offered is greater
than the cost of all those things, you take the job.
Businesses use this same logic. They calculate
their potential revenue and their costs of
production, including implicit costs, to make
informed decisions. This means that companies
in competitive markets don’t make very much
profit.
In fact, economists argue that they make no economic
profit. To be clear, companies need to make accounting
profit to stay in business, so they do make a profit,
just not above and beyond their opportunity costs.
Here’s why: If you're the first one to start
selling glowsticks at a rave, you might make
some economic profit. You would cover the
cost of glow sticks and possibly all of your
opportunity costs, the money you could be
earning doing something else.
But if you’re making a ton of extra money
on top of that, it's likely that glowstick
competitors will jump in the market. Competition
will lower the price and reduce your sales.
New vendors will continue to enter until all
that extra profit disappears, just like the
beautiful light of a glow stick fading away
on Sunday morning. Businesses that stay in
the market make just as much as they would
doing something else.
In other words, they have zero economic profit
— that’s what economists call normal profit.
And it’s the minimum level of economic profit
a company needs to stay in business. But remember,
this is only in very competitive markets that
have low barriers for entry. If it's hard
for other companies to enter a market than
a business can earn economic profit.
Jacob: So now, let’s look at the cost of
production. The actual cost of producing things.
Economists point out that there's two types
of costs: there's variable costs and fixed
costs. Variable costs change with the amount
produced. So, a variable cost for a pizza
restaurant is the costs of ingredients, like
wheat and cheese, and the wages paid to workers.
The more pizza you make, the more of those
resources you need, and the higher those costs.
But, fixed costs, as you might imagine are
fixed. The cost of an oven or rent don’t
change, even if you produce more pizza. Now,
together, fixed costs and variable costs make
up the total cost for a specific number of
pizzas.
Now, Average cost, or the cost per unit, is
the total cost divided by the number of output.
The average cost of producing most things
initially falls as more is produced.
So if the owner of the pizza shop spends $10,000
on a brand new oven, the average cost of that
very first pizza produced is gonna be about
$10,000. The average cost of producing two
pizzas would be around $5,000. And once you get to
10 pizzas, it’s like $1,000 — that’s an expensive pizza.
The more units he makes, the lower the average
cost per pizza, because fixed costs can be
spread over a large number of units. Now obviously
the owner wouldn't have bought that oven if
he expected only to make 10 pizzas.
Buying expensive equipment only makes sense
if you plan on making a lot. That’s one
reason why large companies often have a cost
advantage over small companies.
Adriene: So, the cost to produce only one
car would be really, really high. Like, millions
of dollars. But the average price of a new
car in the US is over $33,000. To keep their
average cost down, car manufactures make hundreds
of cars per day in huge, expensive factories.
Their total total costs are astronomical,
but the average cost per car is relatively low.
Unless you want an Aston Martin or something.
This is called economies of scale. Companies
that produce more can utilize mass production
techniques and spread out their fixed costs
over a lot of units. Economies of scale work
so well, some companies get big enough to
dominate their industry and limit competition
We’ll get to that. For now let’s go back
to the pizza example. Economies of scale means
that a larger pizza restaurant may have a
slight cost advantage compared to a smaller
restaurant because they can afford things
like ovens with conveyor belts. To get the
average cost to fall even further, a restaurant
could automate the entire process and have
robots produce 1000 pizzas per hour, but that
doesn’t make sense if no one wants to buy
all those pizzas. Although it’s great to
keep costs down, the goal of a business is
not to have the lowest average cost. The goal is to
make the right number of pizzas that maximize profit.
To produce the right amount, a business
should follow the profit maximizing rule:
continue to produce as long as the marginal revenue
of the last unit produced is greater or equal
to the marginal cost. This is often shortened
down to “produce where MR equals MC.”
Let’s break it down. Marginal revenue is the
additional revenue earned from selling another unit.
So if a pizza company can sell every pizza for
$10 then their marginal revenue for each is $10.
Marginal cost is the additional cost
of producing another unit.
It is the change in total cost from
producing one more pizza.
So if the marginal cost of another pizza is
$5 and you can sell it for $10 then you should
definitely produce that pizza. You would make
a $5 profit off it. If the marginal cost of
next pizza is $9 then you should produce that
pizza too.
But, if the marginal cost of the next pizza
is $12, you shouldn’t make it. The additional
cost is greater than the additional revenue.
Notice in this example the marginal cost is
increasing. That’s true for the production
of almost everything. The more you make, each
additional unit is eventually going to cost
more. Let’s learn why in the Thought Bubble
Jacob: Businesses have all kinds of variable
costs, but let’s imagine a pizza shop where
the only variable cost is labor. And while
we’re using the power of imagination, let’s
say that they’re making rainbow flavored
pizza. Anyway, when one worker is hired,
that worker does absolutely everything himself.
He purees the rainbows, assembles the
pizza, puts it in the oven, and delivers it.
But, when a company hires a second worker, they
can start to specialize. One worker prepares
the ingredients while the other makes the
pizza and puts it in the oven. Now, this specialization
decreases the the marginal cost of each pizza.
If one worker can make 5 pizzas in an hour,
but two workers can produce 20 pizzas then the
additional cost of each of those pizzas will be lower.
But the benefits of specialization are limited.
As the company continues to hire more and
more workers, the total amount of pizzas they
produce each hour is going to increase at a slower rate
They’ve run up against the law of diminishing
marginal returns. As you add variable resources,
like workers, to a set number of fixed resources,
like ovens, the additional output generated
from each additional worker will eventually decrease.
There are just too many cooks in the kitchen.
Now, eventually, they’ll get to a point
where hiring another worker only adds one
more pizza to their hourly total. Now, the
marginal cost of that last pizza is huge.
And, it's likely to be higher than the additional
revenue the company is gonna get from selling
that pizza. So to maximize profit, a company
should make sure they produce the right number
of pizzas. Where the marginal cost of the
last unit produced is going to be up to,
but not greater than, the marginal revenue.
Adriene: Thanks Thought Bubble. The Law of
Diminishing Marginal Returns applies to all
sorts of tasks. For farmers, there’s likely
to be a large additional yield from fertilizing
a field for the first time, but each time
they fertilize the additional gains diminish.
At some point, too much fertilizer can actually cause
the total yield to fall. This also applies to studying.
The returns from your first hour of studying are high.
Instead of failing your final exam, you may get a C.
Another hour of studying may get you a B and
another hour may get you up to a B+. But every
hour you get lower and lower returns. And, again at
some point — maybe the twelfth hour of studying
— your grade would actually go down since you
stayed up all night and fell asleep during the test.
Understanding this law helps people balance
costs and benefits, but there's one more cost
we need to cover: sunk costs. A sunk cost is a cost
that's already been paid and can't be recovered.
Economists stress that sunk costs
shouldn't be included when making future decisions.
Assume a business spends 2 million dollars
developing a new product, and then no one
wants that product. They have to come up with
something else. The money spent on developing
the first product is a sunk cost and should
be ignored moving forward. This type of rational
decision making seems like common sense, but
behavioral economists point out that people
make irrational decisions all the time.
Think about dating. Imagine a you’ve been
with someone for a couple years. If your relationship
starts going sour, you might try to ignore
the red flags. Who wants to give up on a relationship
that you’ve invested so much time in? Economics
tells us to think about sunk costs and focus
instead on the benefits and costs in the future.
Get outta there!
Jacob: So there you have it. Everything you
need to know to run your own business.
Except, not really. Economics explains
business decision making in broad terms.
Adriene: If you really want to learn all the details,
become an entrepreneur and start a business.
And if you ever get interviewed by Fortune
magazine or The Wall Street Journal,
make sure to tell them that it all started
here, with Crash Course Economics.
Thanks for watching, we’ll see you next week.
Jacob: Crash Course Economics was made with
the help of all these nice people. You can
help with our costs by subscribing to Crash
Course at Patreon, where your support will
help keep Crash Course free, for everyone,
forever. And you get great rewards.
Thanks for watching and DFTBA!
Adriene: Let's break it down. Marginal revenue
is the additional revenue earned from --
[crashing noise]
[laughter] Are you OK?