By now the importance of literacy in the process of development is widely accepted. However, unlike measuring welfare or inequality, the problem of literacy measurement remains largely unexamined. Alternatives to the standard literacy rate, R, equal to the number of literate adults as a percentage of the adult population, are not well known, but this measure has its deficiencies. In particular, several authors have identified the externality accruing to proximate illiterates, that is, illiterate people with access to a literate person. The standard literacy rate ignores this externality; measures of effective literacy are sensitive to it. The present note offers two effective literacy rates (measures) and a set of axioms characterizing each. Nearly all measures of effective literacy appearing in the literature are greater than or equal to R. In fact, the best known of these, the Basu-Foster measure is strictly greater in virtually every case (see Basu and Foster ). Although the inequality L R is an unintended consequence of their construction, it amounts to setting a benchmark for the effective literacy rate. This notes examines Basu and Foster's framework and offers an alternative benchmark.