Question: What is 'if the Shevach exceeds the Hotza'ah'?

Answer: If one gave to his friend [the value of] five Manos of wool and five Manos of ingredients and fixed the wage to be 10, and told him 'dye it red', and he dyed it black, and he told him 'had you dyed it red, it would be worth 25. Now that you dyed it black, it is worth only 10. You lose your [wage]; I do not lose mine.'

Inference (R. Yonah): We learn from this that if one gave to his friend eight Dinarim to buy for him wheat from Tiverya, and he bought from Tzipori, and he told him 'had you bought for me from Tiverya, it would be 25 measures. Since you bought from Tzipori, it is only 20 measures (MAHARA FULDA - the Kav of Tiverya is one and a quarter Kavim of Tzipori.) You lose your [wage]; I do not lose mine.'