Final answer:
Receiving a tax-free fringe benefit of $4,000 is more beneficial for Robinson than receiving an equivalent raise in his salary due to the 40 percent overall marginal tax rate.
Step-by-step explanation:
If Robinson is subject to a 40 percent overall marginal tax rate, receiving a tax-free fringe benefit of $4,000 would be more beneficial for him than receiving an equivalent raise in his salary. This is because the fringe benefit is tax-free, meaning Robinson does not have to pay taxes on it, while his salary increase would be subject to the 40 percent tax rate.
Let's calculate the difference:
- Salary increase: $4,000 x 40% = $1,600 taxes
- Net salary increase: $4,000 - $1,600 = $2,400
- Tax-free fringe benefit: $4,000
As we can see, Robinson would be better off receiving the tax-free fringe benefit of $4,000 as it would be $2,400 more than the net salary increase.