1.
Some [intentional communities], like the Shakers and the Harmony Society, have endured for a century or even longer. The Hutterians, to cite an extreme example, are today still strongly committed to communal living after practicing it, punctuated only by occasional lapses into private enterprise, for 450 years. The Hutterian rate of membership turnover has been only about 0.0006 per year.
Benjamin Zablocki