Answer:
The correct to the first fill in the blank is positive and answer to second fill in the blank is increase .
Explanation:
Cross price elasticity of demand can be defined as the measurement of change in quantity demanded one good that is in response to the change in price of another good.
Cross price elasticity of demand is said to be positive when the gods are substitute, which means that if there is an increase in price of one good than there will increase in demand of other good, same way if there is decrease in price of one good than there will be decrease in demand of other good.
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Answer:
A) attached below
B) 
C) The fiscal policy is called an automatic stabilizer because the taxes are dependent on the level of income and also the output of the multiplier is more stable because it doesn't respond to rapid changes in fiscal policies.
Explanation:
Given data:
C = Co + C1YD
T = t0 + t1Y
YD = Y - T
G and I are both constant
C1 lies between 0 and 1 while T1 lies between 0 and 1
A ) solving for equilibrum output
attached below
B) The multiplier
Multiplier = 
The economy responds to changes in autonomous spending when t1 is 0 but responds less when t1 is positive, this is because the more positive t1 is the lower the multiplier value
c) The fiscal policy is called an automatic stabilizer because the taxes are dependent on the level of income and also the output of the multiplier is more stable because it doesn't respond to rapid changes in fiscal policies.