Anti-pubco MP Greg Mulholland has urged the Government to take action to help tenants.
The Lib Dem MP asked the minister for trade Gareth Thomas to investigate further whether the beer tie is an acceptable practice.
"One important area of British industry that is continually ignored by the Government is the pub industry," said Mulholland.
"There is particular concern at this time of year about the income levels of publicans. May I bring to the Minister's attention the Morgan Stanley report that revealed that between a fifth and a quarter of licensees make under £20,000 a year, which is deemed to be the minimum acceptable level?
"That equates to £3.30 an hour per couple, which is clearly below the minimum wage. Does the Minister therefore agree that the way in which the big pub companies operate the tie is not fair and that the Government should look at that again?"
Thomas replied that he would "carefully consider" any recommendations the Business and Enterprise Committee makes from its inquiry into pubco power.