Estimates are available by demographic characteristics of householders and by the composition of households. The Jain Agamas enumerate five vratas (vows) which ascetics and householders must observe. He installed them as the Acharyas for all followers, including householders and ascetics. "Sallekhana" is a vow available to both for Jain ascetics and householders. Many others celebrate and provide instruction for a vital reciprocity between householders and monastics. It means chastity for householders and celibacy in action, words & thoughts for ascetics. The degree to which these principles are practiced is different for householders and monks. About 45% of those were householders living alone. Utility companies say that smart metering offers potential benefits to householders. Many Nath monks and a few householders also wear notable earrings. However, many of these utensils were expensive and not affordable by the majority of householders. As in Hinduism and Buddhism, the Jain householders support the monastic community. Book three refers to holy householders, forest hermit and penances. This section details some waste minimisation techniques for householders. The Gaon of Vilna considered giving tzedakah "to all householders in our city with tax-benefit".