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Fundamental limits on the source coding exponents (or large deviations performance) of zero-delay finite-memory (ZDFM) lossy source codes are studied. Our main results are the following. For any memoryless source, a suitably designed encoder that time-shares (at most two) memoryless scalar quantizers is as good as any time-varying fixed-rate ZDFM code, in that it can achieve the fastest exponential rate of decay for the probability of excess distortion. A dual result is shown to apply to thedoi:10.1109/tit.2002.808137 fatcat:ry73i7532fd63d7xjhlflojfwq