Many countries that have been experiencing rapid increases in the cases of COVID-19 have also observed that the demand for hand sanitizers has increased tremendously. (a) Is this a case of a "shift" in demand or a movement along a demand curve? Why (b) At least some countries have also passed laws stating that the price of hand sanitizers cannot be raised. What do you predict will be the outcome in the hand sanitizer market in such a country? (Make explicit your assumption about the supply of hand sanitizer in that country)