Answer:
demand peak effort at all times
Step-by-step explanation:
Ideal standards are problematic because they demand peak effort at all times and are almost not achievable standards.
Ideal standards are achievable with maximum efficiency and perfect operations and do not allow for even normal wastage or work interruption due to breakdown of machinery, employees' rest periods, shortage of raw-materials etc.
Such perfect working conditions are not attainable in the real life manufacturing scenarios