In a survey using PPS (Probability Proportional to Size) sampling, a unit $i$ has size $M_i$. If we select a sample of size $n=1$, the inclusion probability is $\pi_i = \frac{M_i}{\sum_{j=1}^N M_j}$. If we draw a sample of size $n > 1$ without replacement, which of the following is true for the inclusion probability $\pi_i$?