The Gubmint's definition of 'essential services' (tucked inside the Covid19 Levels blurb here) includes the airy statement 'including their supply chains'.
This raises the eternal question of exactly what constitutes 'essential' parts of a 'supply chain'.
E.g. the 3-waters functions of TLA's are certainly Essential. But suppose a water main blows (we've had four instances in our street over the space of 18 months). That'll need a digger, a tip-truck at minimum. One of them blows a hydraulic hose. That needs the Hose Guy to roll his truck and fix it. So he's Essential too. The Hose Guy gets a flattie on the way to or from the fix, that needs the Tyre Guy to either roll his truck, or stay open. So the Tyre Guy's Essential too.
You can by now discern where this is going. Just how far down the 'Supply Chain'/Bill of Materials does the Essential designation flow? And how to give certainty to the Hose, Tyre, Parts, Mechanics etc firms as to how Essential they are?
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