Comment on Jackson and Sonnenschein (2007) “Overcoming Incentive Constraints by Linking Decisions”

We correct a bound in the definition of approximate truthfulness used body paper Jackson and Sonnenschein (2007). The proof their main theorem uses different permutation-based definition, implicitly claiming that permutation-version implies bound-based version. show this claim holds only if is loosened. new still strong enough to guarantee fraction lies vanishes as number problems grows, so stated once