I was intrigued by the value so did some research. I would guess the 15$/hour value was chosen to approximate an average gross salary. The annualized payment w

I was intrigued by the value so did some research. I would guess the 15$/hour value was chosen to approximate an average gross salary. The annualized payment would be 31200$[1] and it seems the average annual salary was around 30359$. Updated to 2022 values the annual gross pay would be 10033€ [3], current average annual gross salary is 20483€ [4]. [1] 15$ * 2080 hours [2] https://www.repository.utl.pt/bitstream/10400.5/9819/1/ee-jap-1980.pdf https://www.repository.utl.pt/bitstream/10400.5/9819/1/ee-ja... [3] https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ipc&xlang=en https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ipc&xlang=en [4] https://www.pordata.pt/pt/estatisticas/salarios-e-pensoes/salarios/salario-medio-anual-ajustado-tempo-inteiro https://www.pordata.pt/pt/estatisticas/salarios-e-pensoes/sa...