?ata???ste t?? ??s?a t?? ??µ?? t?? f?????sa? ?pe?ß?????sa? ap?d?s?? (ep?s?? ???st?? ?? ??µ?? t?? µetaß??t?? a?a??????, a??? t?? f?????sa? ???a??? pa?a??????t?ta? ? f?????sa ???a?? ap?d?s?) se µ???? 50 ?ept? µe a?t? t? p?a?t??? ?a? s???pt??? ß?ß???. ??t?? ? ?eµe???d?? ??????µ???? ??µ??, ? ?p???? a?apt?????e ap? t?? s?µa????ta ??eta?? ??????µ????? David Ricardo, de???e? ?t? a? a????e? ? p?s?t?ta e??? s???e???µ???? s??te?est? pa?a?????, t? ???a?? p????? t?? pa?a??????? d?ad??as?a? µe???eta?, ?d????ta? se ?aµ???te?e? ap?d?se??. ?? ß?ß??? a?t? ap?te?e? µ?a e????st? e?sa???? st?? efa?µ???? t?? ??µ?? t?? f?????s?? ap?d?se?? sta ??????µ??? t?? ep??e???se??, sta ??????µ??? t?? t?µ?a ?a? st? ?e???a t?? ?a???t?µ?a?. ?e???aµß??e? ep?s?? t?? e??tas? µ?a? µe??t?? pe??pt?s?? p?? ape??????e? t?? ep?pt?se?? t?? ??µ?? t?? f?????s?? ap?d?se?? st? ß??µ??a??a pet?e?a???, µ?a s???t?s? t?? ad??aµ??? t?? ?e???a? ?a? µ?a e?sa???? se s??af? µ??t??a ?a? epe?t?se??, ?p?? ?? ap?d?se?? ???µa?a? ?a? ?? ?s?d???µe??.