[cf9]

Previously, I didn't know the cost to manufacture the vaccine is so low as $1.5 to $3. This might be a factor in the usefulness of the vaccine.

Moderna costs more as it has more vaccine concentration than the other.

In manufacturing, you pay more, you get better quality products. eg light bulbs (the material can last longer).

Vaccine not cure.
 mrna vaccine just telling body to create antibodies.  Itself not going to kill covid.
higher dose is just instructing your body to create the antibodies.

inactivated is throw dead cell will cannot multiple into your body to let the body own time own target wipe the covid die cells off.