Why did luke's dad sell the woods behind the house in among the hidden?

In "Among the Hidden" by Margaret Peterson Haddix, Luke's dad sells the woods behind their house to make money during tough economic times. The family struggles with the restrictions imposed by the government on having more than two children, making it difficult for them to sustain their farm. Selling the woods signifies the desperation and sacrifice the family faces to survive in a society that devalues their existence. This decision also creates a sense of loss for Luke, as the woods represented a place of freedom and safety for him.