Crossword Clue:

the exchange of one thing for another

AnswerCrossword Clue
SWAPExchange one thing for another
TRADEOFFGiving up of one thing for another
SYMBOLOne thing standing for another
QUIDPROQUOOne thing in return for another.
RATIOOne thing on top of another?
PILEOne thing on top of another
HEAPOne thing on top of another
RATIORelation of one thing to another.
SYMBOLIt's just one thing instead of another