A stochastic process {xt: t = 1,2,….} with a finite second moment [E(xt2) < ![A stochastic process {x<sub>t</sub>: t = 1,2,….} with a finite second moment [E(x<sub>t</sub><sup>2</sup>) < ] is covariance stationary if: A) E(x<sub>t</sub>) is variable, Var(x<sub>t</sub>) is variable, and for any t, h 1, Cov(x<sub>t</sub>, x<sub>t+h</sub>) depends only on 'h' and not on 't'. B) E(x<sub>t</sub>) is variable, Var(x<sub>t</sub>) is variable, and for any t, h 1, Cov(x<sub>t</sub>, x<sub>t+h</sub>) depends only on 't' and not on h. C) E(x<sub>t</sub>) is constant, Var(x<sub>t</sub>) is constant, and for any t, h 1, Cov(x<sub>t</sub>, x<sub>t+h</sub>) depends only on 'h' and not on 't'. D) E(x<sub>t</sub>) is constant, Var(x<sub>t</sub>) is constant, and for any t, h 1, Cov(x<sub>t</sub>, x<sub>t+h</sub>) depends only on 't' and not on 'h'.](https://d2lvgg3v3hfg70.cloudfront.net/TB8272/11eb6b8a_02a7_9d09_bf83_7b7fec60869d_TB8272_11.jpg)
] is covariance stationary if:
Definitions:
Disposable Income
The spendable income of households after income tax deductions tailored for saving and spending.
Disposable Income
The financial resources meant for household spending and saving after settling income taxes.
Saving
The act of setting aside a portion of current income for future use, either by holding the funds in cash or investing them.
Disposable Income
Spendable and savable funds available to households after the deduction of income taxes.
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