Which of the following is not a property of isoprofit curves graphed in Probability of Injury $(x-$axis$)$ versus Wage $(y-$axis$)$ space?

Multiple Choice

Isoprofit lines are upward$-$sloping.

Isoprofit curves going up along the $y-$axis yield higher profits.

Profit$-$maximizing firms are indifferent as to where they operate on any given curve.

All points on each isoprofit curve yield the same level of profit.

Isoprofit curves going out along the $x-$axis yield higher profits.