On 20th January 2021, Jose Mida entered into an agreement with Zuma Juma in which Zuma Juma agreed to smuggle some goods into the country for Jose Mida by the end of March 2021. Jose Mida promptly paid Zuma Juma the agreed consideration of 500,000ksh in full, but Zuma Juma has reneged on the deal. Jose Mida feels aggrieved and intends to sue Zuma Juma.

a) Analyze the legal principle applicable in this case. (10 marks)