Random Almost-Popular Matchings

For a set $A$ of $n$ people and a set $B$ of $m$ items, with each person having a preference list that ranks all items from most wanted to least wanted, we consider the problem of matching every person with a unique item. A matching $M$ is called $ε$-popular if for any other matching $M'$, the number of people who prefer $M'$ to $M$ is at most $εn$ plus the number of those who prefer $M$ to $M'$. In 2006, Mahdian showed that when randomly generating people's preference lists, if $m/n > 1.42$, then a 0-popular matching exists with $1-o(1)$ probability; and if $m/n < 1.42$, then a 0-popular matching exists with $o(1)$ probability. The ratio 1.42 can be viewed as a transition point, at which the probability rises from asymptotically zero to asymptotically one, for the case $ε=0$. In this paper, we introduce an upper bound and a lower bound of the transition point in more general cases. In particular, we show that when randomly generating each person's preference list, if $α(1-e^{-1/α}) > 1-ε$, then an $ε$-popular matching exists with $1-o(1)$ probability (upper bound); and if $α(1-e^{-(1+e^{1/α})/α}) < 1-2ε$, then an $ε$-popular matching exists with $o(1)$ probability (lower bound).

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