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if somebody [[strikethrough]] of [[/strikethrough]] making mats which at low end of ranking, know they're in trouble because opport. cost of that job near zero

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Feb 11 - marginal productivity + marginal utility

marginal utility - 1st unit most valuable, 2nd less valuable in utility, etc. 

marginal productivity - 1st unit increases productivity the most, 2nd less productive, etc. 

example H.K. fishing boats, formerly lived on boats (used to be considered not really Chinese by land-based Chinese) when motorized made possible living on land - to consider marginal utility must consider fact no longer outcast group, kids can attend schools, become much more mobile
in trad. system just look at yields + output
not motors more costly + must pay for gas but when consider all trade - offs is worth it
marginal utility of 1st unit (motor) high, but then some began to get longer engines - increased yield compared to cost not as great, but still high then still larger but then sold largest