  Via numerical experiments, we show that the $\sim$10%-20% passive fraction
seen at $z>3$ is consistent with galaxy star formation histories being
maximally correlated stochastic processes. If so, this fraction should reflect
a time-independent baseline that holds at any epoch or mass regime where mean
star formation rates are rising. Data at $\log M_\ast<10$ and $z<0.5$ bear this
out, as should future James Webb Space Telescope observations.
