After recalling the two step-by-step chain-generation procedures of long chains used in Monte Carlo simulations, which lead respectively to absorbing and to reflecting statistics, a suggestion is made regarding the statistics to be considered when polymer chains are confined. According to this suggestion, which originates in the respective shapes of the chain-step concentration profiles, there is in good solvents a shift of statistics from absorbing to reflecting, when the dimensions of the bounding surface become comparable to or smaller than those of the free (non-confined) chain.