Key points are not available for this paper at this time.
Michael Chandler, Anna S. Fritz, Suzanne Hala, Small-Scale Deceit: Deception as a Marker of Two-, Three-, and Four-Year-Olds' Early Theories of Mind, Child Development, Vol. 60, No. 6 (Dec., 1989), pp. 1263-1277
Chandler et al. (Fri,) studied this question.