Microeconomics questions

1.  You recently acquired a bakery on the
main downtown street.  There is another
bakery not far away.  Otherwise, you face
no real competition.  At this point, you
are still unclear about the personality and management style of the owner of
the other bakery.  You have contemplated
three possible strategies: (1) produce a lot of cakes and mark down their
prices to try to sell a large quantity; (2) limit your production of cakes, but
charge a high price for them; or (3) politely engage the owner of the other
bakery in a conversation, and consider proposing that the two of you collude on
prices and adjust your production levels accordingly.  Depending on what the owner seems to be like,
which of the choices would be best from the standpoint of profitability?  Discuss the possibilities fully.

2.  The firms in a perfectly competitive
industry had been earning zero economic profits.  However, the firms have recently experienced
a large decrease in the cost of energy that enables them to substantially
reduce the marginal cost and average total cost of producing each unit of
output.  The market demand for the
product is pretty elastic.  On the other
hand, short-run efforts to increase production run into severely diminishing
returns with respect to the employment of additional variable inputs.

two average total cost curves (ATC) for a typical firm.  One curve should represent ATC before the
fall in the cost of energy.  The other
curve should represent ATC after the fall in the cost of energy. Assume that
the fall in the cost of energy does not affect the minimum efficient scale (MES)
of production.  Draw short-run marginal
cost curves on the same diagram to show both the fall in the cost of energy and
the severely diminishing returns to the employment of additional variable

to the diagram for a typical firm, draw a supply-demand diagram for the
industry.  The slope of the demand curve
should reflect the elasticity of demand for the product.  The short-run supply curve should reflect the
presence of severely diminishing returns with respect to the employment of
additional variable inputs.  The original
equilibrium price in this diagram should line up with the minimum point of the
original ATC curve for a typical firm.

shift demand or supply to reflect the fall in the cost of energy.  Note the change in the market
equilibrium.  How does the magnitude of
the change in the market price compare to the magnitude of the shift in
ATC?  Explain.  Do firms now experience short-run economic
profits?  In the long-run, can entry of
new firms be expected in this industry? If we have a decreasing-cost industry, show in your diagrams where the cost
curves, the market price, and the equilibrium market quantity end up.  Fully explain what has happened.  Does the equilibrium quantity end up changing
much in comparison to the magnitude of the overall change in price?  Why or why not?

3.  Use your knowledge about two-part pricing
to advise the company below.

A company
has a bar and is trying to decide on the cover charge (if any) and price for
each drink.  It has done a modest survey
in which it asked customers to classify themselves as light drinkers or heavy
drinkers and to indicate the number of drinks they would typically consume
during the evening.

The estimate from
the survey is that a change in the price equal to $1 per drink causes light
drinkers to change their consumption on average by 0.5 drinks per night.  However, a change in price of $1 causes heavy
drinkers to change their consumption on average by 1.0 drink per night.  For both groups a typical consumer will not
consume anything once the price reaches $9 per drink. (They may instead go to
another bar or not go to a bar at all.)

Draw a demand curve
for a typical light drinker and for a typical heavy drinker on the same
diagram.  Explain your diagram.  Write equations for the curves in
slope-intercept form. The general form for such an equation is P = a + bQ,
where P is the price for the drinks, Q is the quantity of drinks purchased, ‘a’
is the intercept on the vertical axis, and ’b’ is the slope. (In the case of a
downward-sloping demand curve, the slope will be a negative number.)

If 300 people visit
the bar on a typical evening, with 200 people being light drinkers and 100
people being heavy drinkers, draw an overall demand curve for all of the
consumers combined.  (Figure out the
intercept on the vertical axis; this intercept indicates the price at which
nobody would purchase anything.  Also
determine the intercept on the horizontal axis; this intercept indicates what
the total quantity demanded would be if the price of drinks were zero.)

What is the slope
and what is the intercept for this demand curve?  Write an equation in slope-intercept form.

Recall that, in the
case of a straight-line demand curve, the slope of the marginal revenue line
for a company that does not practice price discrimination is double the slope
of the (total) market demand curve. 

If the marginal cost
of making drinks (the alcohol, the bartender’s labor, and the amortized cost of
purchasing glasses and cleaning them repeatedly) is constant at $5 per drink,
and if no cover charge is assessed, what is the best price to charge for
drinks?  How many drinks would be sold on
a typical evening?  What would your
profits be? Show your work.

If you cut your price by $1 per drink AND assess the maximum
possible cover charge without causing a typical light drinker to refuse to
enter the bar, would your profits improve? 
How high would the cover charge be? 
Calculate both the cover charge and your total profits.  Would the new pricing increase profits?  Explain your answer fully.

4.  Tesla,
the electric car maker, has expressed an intention to carry out production in
Fremont in a way that makes intensive use of industrial robots.  It must balance this intention with the
judgement and adaptability offered by human workers and the additional
productivity made possible by installing conventional equipment for the
production of automobiles.

50 robots are being leased from a Japanese provider at a cost of $100,000 per
robot per year.  The marginal product of
a robot corresponds to 500 additional cars per year.  Each piece of conventional equipment is being
leased from a German provider at a cost of $20,000 per year.  Its marginal product is 125 additional cars
per year. The going rate of pay for the human workers is $80,000 per year.  One hundred workers are employed.  The marginal product of a worker amounts to
450 additional cars per year.

things equal, the marginal product of an input falls as more of it is employed.

is expected that 10 workers will quit or retire by the end of the year.  Tesla plans NOT to replace them.  Instead, Tesla has in mind the use of 10 additional
robots next year.

on the efficiency of Tesla’s use of robots. 
Comment also on Tesla’s use of humans vs. its use of conventional
equipment.  Should Tesla become more
labor-intensive?  More
equipment-intensive?  Fully explain your

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