In: Economics
Find nash equilibrium for t and y
utitily functions for rich (r) and poor (p)
y is income and t is tax.
ur = y(1 − t) − 0.5y 2
up(t, y) = ty
We have the utility function of rich and poor as follows:
The utility function of rich is

The utility of poor is

Here, the two players are rich (r) and poor (p), where t = tax and y = income.
Considering the utility function of rich,

if 'r' chooses (t) then we have to differentiate the utility
function of rich with respect to (t), hence we get the
following



if 'r' chooses (y) then we have to differentiate the utility
function of rich with respect to (y), hence we get the
following



The Nash Equilibria occurs at the best response of (t) and (y) at (t*,y*), hence we have the Nash equilibrium of rich as follows

Considering the utility function of poor,

if 'r' chooses (t) then we have to differentiate the utility
function of poor with respect to (t), hence we get the
following



if 'r' chooses (y) then we have to differentiate the utility
function of rich with respect to (y), hence we get the
following



The Nash Equilibria occurs at the best response of (t) and (y)
at (
,
),
hence we have the Nash equilibrium of poor as follows

Conclusion:
The Nash Equilibrium of rich

The Nash Equilibrium of poor
