Speaking for the Scottish Chambers of Commerce, Mr Clark said corporation tax on its own "produced volatile returns", but agreed the tax was a "potential source for benefit for businesses in the long term".
It was agreed that the lottery would be repaid from future returns from developments at the Olympic Park, but the committee said current projections suggest the first payment will not be until the mid-2020s.
Israeli and Palestinian security officials agreed a few days earlier to try to work out a truce before US peace envoy Anthony Zinni returns to the region, on or around 18 January.