MESCAMining Equipment and Services Council of Australia
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The conclusion is that investments with a public good aspect (affecting multiple sites simultaneously, though not necessarily equally) are invested in until the sum of their MESCA equals the individual site MESCA.
The implication is that each agency considers facilities (public or private) on a unique scale such that some facilities will typically appear to have a high MESCA based on subjective rankings and exclusion of facilities outside the agencies' jurisdiction.
For sites and vulnerabilities that are worth investing in, equate the MESCA for all sites and vulnerabilities.
There is a cutoff MESCA where it is optimal not to expend anything on the site as the MESCA is too "low.