numerical value

Do mathematical concepts make sense outside of a hypothetical space? Especially, what are the problems with assigning numbers to concepts where the various processes of assigning these different numbers are subjective, as in economics?

Does one plus one equal two
-if you add two ponds together (equals one bigger pond),
-two humans a male and female might equal three (including a child),
-two rabbits (a male and female) might equal hundreds
-there may be one apple and another apple but they are not the same size or equal weight
-you might only want to eat one apple, so the second one is redundant or of lesser value than the first, or may effectively be the same thing as one appleas far as you’re concerned.
-there might only be one of something, for example one planet earth
- the value of a thing may be contested or undeterminable, or changeable
-a thing may either gain or decrease in value as time passes- the orange may rot or the orange tree grow bigger

This is not adequately appreciated in the use of figures such as statistics in explaining and analysing real world events. For example, market value is an almost meaningless average.