We show that there is a sharp threshold in dimension one for the transport cost between the Lebesgue measure $\lambda$ and an invariant random measure $\mu$ of unit intensity to be finite. We show that for \emph{ any} such random measure the $L^1$ cost are infinite provided that the first central moments $\mathbb{ E}[|n-\mu([0,n))|]$ diverge. Furthermore, we establish simple and sharp criteria, based on the variance of $\mu([0,n)]$, for the $L^p$ cost to be finite for $0<p<1$.
Categories: math.PR