Oxygen is free. Wherever you go, there is an unlimited supply all around you.
Nobody has access to more or less oxygen than anybody else has, and nobody
ever has to pay for oxygen.
What you DO pay for is to have someone compress (or liquify) the oxygen,
stuff it into a suitable container for you, and deliver it to you. Prices depend
on the pressure in the container, the volume inside the container, and the
purity of the oxygen in there ... the oxygen you need for respiratory therapy
will be different and more expensive than the oxygen you use for welding.
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Yes - consecutive serial numbers make them more valuable, when sold.
Information is better. Because if you have any money and information you have no money to be destroyed. With the information you can get you money. But having health of both is better.
They didn't have enough money to buy gold and other valuable products
No valuable is an adjective.
Valuable