In: Accounting
Most people prefer the first lottery in Question 1 but the second lottery in question 2.
Allais Paradox.
Question 1: ($1,1) or ($1,0.89; $5,0.10; $0,0.01)
Question 2: ($1,0.11;$0,0.89) or ($5,0.10;$0,0.90)
Most of the people prefer first lottery in question 1 but the second lottery in question 2.
Suppose we strictly prefer ($1,1) to ($1,0.89;$5,0.10;$0,0.01)
Value functions v(x) ={ x^0.1 if x>=0
2x if x<0
V(1)> 0.89 v(1)+ 0.10 v(5) + 0.01 v(0)…………………………..(i)
Now suppose we strictly prefer ($5,0.10;$0,0.90) to ($1,0.11; $0,0.89)
0.10 v(5) + 0.90 v(0)> 0.11 v(1) + 0.89 v(0)
=> 0.10 v(5) + 0.01 v(0) > 0.11 v(1)
=> 0.89 v(1) + 0.10 v(5) + 0.01 v(0) > v(1)………………………….(ii)
(i) and (ii) opposed to each other.
If you are EU, then you cannot choose the first lottery in question 1 but the second lottery in question 2.
This explains the Allais Paradox.