from point e to point d

from point c to point b

from point d to point c

from point b to point a

More people are using credit and debit cards, so people are not accustomed to using change.

Prices have increased over time, and the opportunity cost of carrying around a large number of coins would be low.

The opportunity cost of carrying around large quantities of coins is too large.

Retailers find it too expensive to deal with coins and would have to raise their prices if consumers used coins more.

tradition, command, and market

tradition, command, and central planning

tradition, central planning, and communal

command, market, and socialism

that guns are always traded for butter.

the constant rate of technological progress.

the fundamental concept of scarcity.

the rapid growth in the South African economy.