A fully additive model of the utility function $U\left(c_{1, i}, c_{2, i}\right)$, where $i$ indexes time and $c_{1}$ and $c_{2}$ are two different goods, has which features?
A) Utility is additive across $i$ (time).
B) Utility is additive across goods 1 and 2, but not across $i$ (time).
C) Utility is neither additive across goods or time.
D) Utility is additive across $i$ (time), but the function form may change in each time period.

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The Answer of A fully additive model of the utility function $U\left(c_{1, i}, c_{2, i}\right)$, where $i$ indexes time and $c_{1}$ and $c_{2}$ are two different goods, has which features?
A) Utility is additive across $i$ (time).
B) Utility is additive across goods 1 and 2, but not across $i$ (time).
C) Utility is neither additive across goods or time.
D) Utility is additive across $i$ (time), but the function form may change in each time period.

A Fully Additive Model of the Utility Function U(c1,i,c2,i)U\left(c_{1, i}, c_{2, i}\right)U(c1,i​,c2,i​)

A Fully Additive Model of the Utility Function $U\left(c_{1, i}, c_{2, i}\right)$