Speaking at the association's Lead 2014 conference following the release of its 'Advertising Pays 2: How Advertising Can Unlock UK Growth Potential' report, Lefroy said: "We should be careful not to assume the government can do everything.
"Probably, they could cut down the mass of schemes they have available to small businesses because they're not clear and they're not understood."
The report particularly focuses on how small and medium-sized enterprises could benefit financially and drive the economy if they invest in advertising.
Watch the video above to hear more from Lefroy on the relationship between the government, adland and SMEs.