Abrams_1995_197 AbramsE. 1995 197 FoustJ.B. de SouzaA. 1978 25 labor procurement food Classical Maya Mesoamerica Measuring labor productivity as factor of number of workers individual var2 * 4 groupworking teams var1 / 4 Abrams discusses efficiency of maize collecting as factor relating to number of workers: highest yield per worker is found with 4 workers. BuccellatiF. MarkoJ.22.2.2019