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Collective, explosive flow in central heavy ion collisions manifests itselfin the mass dependence of $p_T$ distributions and femtoscopic length scales,measured in the soft sector ($p_T\lesssim 1$ GeV/c). Measured $p_T$distributions from proton-proton collisions differ significantly from thosefrom heavy ion collisions. This has been taken as evidence that p+p collisionsgenerate little collective flow, a conclusion in line with naive expectations.We point out possible hazards of ignoring phase-space restrictions due toconservation laws when comparing high- and low-multiplicity final states.Already in two-particle correlation functions, we see clear signals of suchphase-space restrictions in low-multiplicity collisions at RHIC. We discuss howthese same effects, then, {\it must} appear in the single particle spectra. Weargue that the effects of energy and momentum conservation actually dominatethe observed systematics, and that $p+p$ collisions may be much more similar toheavy ion collisions than generally thought.

Do p+p Collisions Flow at RHIC? Understanding One-Particle Distributions, Multiplicity Evolution, and Conservation Laws