Context: In the neighborhood of the house upon which we made an offer , the association had apparently declared Yard Sale Day , so I stopped at a few , but nobody was selling anything I wanted , except four old , stout dining room chairs we do n't have room for . I bought nothing , and returned home . I ate a big lunch . 
Question: Why would the narrator feel the need to eat a big lunch ?
The narrator was tired from looking for bargains . The narrator was tired from shopping .