Ishchini yollash shartnomasi uning sarflagan mehnatidan olinadigan foydaga taalluqlidir va ish haqi shu foyda bo‘yicha baholanadi. Mehnatning o‘zi na ish haqining o‘lchovi, na foydaning o‘lchovidir; aks holda toshtarosh ustaning ish haqi muhandisnikidan ko‘p bo‘lishi kerak edi, chunki toshtarosh ustaning mehnati ko‘proqdir; bu esa voqelikka zid. Demak, ish haqi foydaning mukofotidir, mehnatning mukofoti emas. Bundan tashqari, ish haqi ishchining turiga ko‘ra farqlanadi va o‘zgaradi, xuddi shu ishchining o‘zi uchun ham foyda darajasidagi farqqa ko‘ra o‘zgaradi, lekin mehnatdagi farqqa ko‘ra emas. Ikkala holatda ham shartnoma ish beruvchining foydasi ustida tuzilgan, ishchining mehnati ustida emas. Shuning uchun muhim bo‘lgan narsa natijadir: u turli ishlarda turli ishchilarning natijasi bo‘lsinmi yoki bir xil ishda turli ishchilarning natijasi bo‘lsinmi; mehnatga umuman e’tibor berilmaydi. Ish natijasi mehnatning mevasi ekani rost, u turli ishlarda yoki bir xil ishni turli kishilar bajarganda ham shunday, lekin maqsad natijaning o‘zi, faqat mehnat emas, garchi bu ish haqini baholashda e’tiborga olinsa ham. Agar kishi qurilish uchun yollangan bo‘lsa, ish haqi vaqt bo‘yicha yoki ish hajmi bo‘yicha baholanishi kerak. Agar ish hajmi bo‘yicha baholansa, foyda bino joylashgan joyida, uning uzunligi, kengligi, qalinligi va qurilish materialida yaqqol namoyon bo‘ladi. Agar ish vaqt bo‘yicha baholansa, ish foydasi odatda vaqt ortishi bilan ortadi, vaqt kamayishi bilan kamayadi. Shunday qilib, vaqt ko‘rsatilgan holda ishning tavsifi foydaning o‘lchovidir. Agar ish vaqt bo‘yicha baholansa, ishchi odatdagi imkoniyatidan ortiq ishlamasligi va odatdan tashqari og‘ir mehnat qilishga majbur etilmasligi kerak.

The contract to hire an employee applies on the benefit of the effort He expends; and the wage is evaluated in terms of this benefit. The effort itself is neither the measure of the wage, nor the measure of the benefit, otherwise the wage of the stonemason would be greater than the wage of the engineer because the stonemason’s effort is greater; and this is contrary to the reality. Therefore, the wage is a recompense for the benefit and not for the effort. Besides that, the wage differs and changes according to the type of employee, and it also changes for the same employee according to the difference in the standard of the benefit, but not according to differences in effort. The contract in both cases was over the benefit of the employer, not over the employee’s effort. So what does matter is the result, whether it was of different employees in different works, or of different employees in the same work; and there is no consideration given to the effort at all. It is true that the result of the work is the fruit of the effort, whether it was in different works, or in the same work done by different people, but what is intended is the result, not only the effort, even though this is noticed in the evaluation of the wage. So if a person was hired for building, then the wage should be evaluated by the time or by the work. If it was evaluated by the work, then the benefit will obviously be manifested in the location of the building, its length, width, thickness and the material of the building etc. If the work was evaluated by time, then the benefit of the work usually increases as the time increases, and decreases as the time decreases. Thus the description of the work together with the mentioning of the time is the measure of the benefit. If it is evaluated by time, the person should not work more than his usual capacity, and should not be obliged to do unusually hard labour.