Kuala Lumpur, March 8 -- And so the world enters another week in its war against Covid-19.

There have now been over 100,000 cases and 3,000 deaths from the virus.

Factories, schools and offices in disparate parts of the world have come to a standstill, stock markets have been routed.

One of things I have found interesting is the extraordinary behavioural change this crisis has revealed. People are acting differently.

In France, people are reluctant to kiss each other on the cheek - their quintessential Gallic greeting. Elsewhere you see the absurd stockpiling of toilet paper and well, people everywhere are washing their hands like they are Lady Macbeth.

As any marketing company or psychologist will tell you, behavioural change is har...