People are walking by stores and window shopping.
The people cannot afford the products.
Window shopping does not necessarily mean they cannot afford the products.
exists e1 x1 x2 x3 x4 x5.(by(e1,x2) & n_shopping(x4) & of(x4,x5) & n_window(x5) & n_store(x3) & subset_of(x4,x2) & subset_of(x3,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists x1 x2.(n_product(x2) & n_people(x1) & -exists e1 p1.(exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_afford(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1)))