Core answer
A proposal to examine
Exchange is the movement of useful goods and services so that families can meet needs they cannot fulfil alone. It becomes exploitative when scarcity, information or power is used to take disproportionate value from another's need or labour. Fair exchange preserves mutual prosperity and keeps the purpose of trade connected to fulfilment rather than accumulation.
ReflectionLook at one purchase and consider whether value and need were served on both sides.