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In the German krankenkassen in which membership is obligatory, which include local and rural krankenkassen and those of particular trades and industrial groups, the total number of members has shown an upward trend in recent years, as may be seen in the adjoining tabulation.At first sight, the number of members in the krankenkassen appears to run parallel with the amount of available employment. In times of great scarcity of work (1924) there appears to be a decline in the number of members; if the labor market improves there seems to be an increase in the membership of the krankenkassen. But appearances are deceptive. The krankenkassen with obligatory membership that make up the federal insurance system have, however, voluntary as well as obligatory members. Their number is considerable and is independent of the state of the labor market.The variations in the number of obligatory members thus correspond
BERLIN. JAMA. 1928;91(14):1051-1052. doi:10.1001/jama.1928.02700140053023