7/
The commentaries by @AndreaSaltelli @Jeroen_van_der_Sluijs @blair_fix may also recall the problematic timeline discussed in [4]

The "#MonetaryValuation, or monetization, of #EcosystemServices (MES)" is often said as "emerged in 1997. In fact, there is a long history, starting in the late fifties but largely ignored, of sustained attempts to assign monetary values to nature's services. These early efforts encountered many conceptual and methodological roadblocks, which could not be resolved"