Find the value(s) of t for which the tangents to 
is/are horizontal.
Definitions:
Annual Consumption
The total amount of goods and services used or consumed by individuals or groups within a one-year period.
Disposable Income
Disposable income refers to the amount of money that households have available for spending and saving after income taxes have been accounted for.
Aggregate Household Wealth
The total net worth held by the households in an economy, combining all assets minus liabilities.
Durable Goods
Things that last at least a year or two.
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