I want to know the answer to the following question:
What did von Neumann consider for his model of expanding economy?
All the background I'm provided with is that "Von Neumann's model of an expanding economy considered the matrix pencil  A − λB with nonnegative matrices A and B; von Neumann sought probability vectors p and q and a positive number λ that would solve the complementarity equation". Is that enough to answer the question?
Answer: yes