3. Feedback comes in two varieties: amplifying feedback
and dampening feedback. Suppose an increase in variable A
increases variable B. With amplifying feedback the higher value of
B will work to make A even larger, but with dampening feedback,
the higher value of B will tend to decrease the value of A. Decide
whether each of these cases of feedback below represents
amplifying or dampening feedback, then put a check mark in front
of those items that are examples of
a. When income
goes up, people spend more; when people spend more,
income goes up.
b. When money
stock is increased, price level rises; when price level
rises, the amount of commodity money falls.
c. When the
number of whales decreases, their price rises; when their
price rises, people hunt more intensely.
d. When the
number of cattle decreases, their price rises; when their
price rises, producers produce more.
e. When people
riot more, police respond with greater violence; as the
police respond with greater violence, people riot
f. As a star
collapses, its heat rises; the greater the heat, the more
a star will expand.
g. The fatter
John gets, the unhappier he is; the unhappier John gets,
the more he eats.
h. As the oxygen
in the blood declines, an animal breathes faster; as it
breathes faster, the oxygen in the blood rises.
i. When prices
rise, workers demand higher wages; as wages rise,
producers increase their prices.