In the Krita Yuga, the distinctive characteristics of the Brahmanas, the Kshatriyas, the Vaishyas and the Sudras were the same and all men were engaged in their own respective duties.
ब्राह्मणाः क्षत्रिया वैश्याः शूद्राश्च कृतलक्षणाः। कृते युगे समभवन् स्वकर्मनिरताः प्रजाः॥