Text: The second issue is addressed by assuming that the relationship between age and willingness-to-pay for fatal risk reductions can be approximated using an adjustment factor derived from Jones-Lee (1989).
Entailment: We're assuming, for the second issue, that the relationship between age and willingness-to-pay for fatal risk reductions can be approximated.
Contradiction: Our theory doesn't allow us to approximate a number yet, so we need to leave the second issue as it is for now.