Answer:
The false premise that Swift relies on to build his argument in this passage is that the wealthy will be willing to buy and consume children.
Step-by-step explanation:
A false premise is a false proposition that works a fundament to present an argument, as it is shown in this excerpt from "A modest proposal" by Jonathan Swift when he states that wealthy people will be more than willing to pay poor people for their children to use them as food, and in that way stop the lack of food for Irish population.