Impact of COVID on companies valuation

What is the impact of the current sanitary crisis on companies' valuation? The answer is so far challenging and depends on the economy recovery speed. In a valuation multiples' approach, a temporary effect can be factored in as a "one-off", with no change on normalized aggregates. If the recovery takes more time (i.e. in case of "Nike" curve), then aggregates need to be adjusted ... and no doubt that EBITDAC will become the new standard of valuation experts and investment bankers!