Maurice and Ronald contract for Maurice to give Ronald a permanent (for his hair). Maurice does a good, professional job, but Ronald declares himself dissatisfied with that job and thus refuses to pay. His justification is that Maurice got one hair out of place. Does this deviation from perfect performance justify Ronald's refusal to pay? What result if the contract had included a clause making Ronald's duty to pay contingent on Ronald's personal satisfaction with the perm. Do not consider quasi-contract, and assume that Maurice's performance was not expressly made a condition of Ronald's duty to pay. Discuss.