Before revision:  Our results show that the throughput of Geometric Retransmission (K = 1) is inherently unstable for large n since its stable throughput region vanishes as the number of nodes n -> infinity; while the throughput stable region of Exponential Backoff still exists even for an infinite population.
After revision:  Our results show that the throughput of Geometric Retransmission (K = 1) is inherently unstable for large n since its stable throughput region of the exponential backoff scheme exists even for an infinite population.