Answer and Explanation:
According to the scenario, computation of the given data are as follow:-
1) Marginal propensity to consume (MPC) for this economy is 0.75 as it denotes the spending of the household and saving of 0.25 and the spending multiplier for this economy is 
= Spending Multiplier(M)
= 1 ÷ 1 - MPC
= 1 ÷ 1-0.75
= 1 ÷ 0.25
= 4
2). Decrease in government purchases will lead to a decrease in income, generating an initial change in consumption
= -Amount of Government Decrease Purchases by × MPC
= -$250 billion × 0.75
= -$187.5 billion
3). Decrease income again, causing a second change in consumption
= Amount Decrease in Government Purchases × MPC
= -$187.5 billion × 0.75
= $140.6 billion
4).Total change in demand resulting from the initial change in government spending
=  Amount of Government Decrease Purchases by × Spending Multiplier(M)  
= $250 × 4 
= $1,000 billion
= $1 trillion
 As we can see that the income falls by $1000 billion in the end, so AD shifts to the left by the size of $1 trillion
In the question the graph is missing. Kindly find the attachment for both of question and answer
 
        
             
        
        
        
Type of employment, indicator for chronic illness, drug, or alcohol use these variables are likely useful to add to the regression to control for important omitted variables.
What is sleep pattern?
The word sleep pattern, commonly referred to as a sleep-wake pattern, refers to a person's schedule for going to bed and getting up as well as their napping habits. The frequency and length of sleep disruptions may also be part of the sleep pattern.
Type of employment, Chronic illness and drug/alcohol use they ought to be included in regression since they disturb sleep patterns.
As a result, option (a) Type of employment. (b) Indicator for chronic illness. (c) Drug or alcohol use is correct.
Learn more about on sleep pattern, here:
brainly.com/question/25287169
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The initial investment is the total amount spent or the amount of cash outflow.
The initial investment here is -
Proper cash flow amount = Cost of land (present cost of land) + Cost of Plant + Cost of Grading
Proper cash flow amount = $ 4,300,000 + $ 11,500,000 + $ 670,000
Proper cash flow amount = $ 16,470,000