Text: Here's the final thing you should keep in mind when you read about the nation's overall trade  The nation is nothing but the sum of individual households.
Entailment: When you're reading about the nation's trade, remember it is made up by individual households in the end.
Contradiction: When thinking about the nation's overall trade, keep in mind that it should always be considered on a large scale and not in terms of individual households which don't have much effect.