When vaisyas are sudras:
At the present moment the so-called vaisyas are sudras, less than sudras. Why? Now the vaisyas business is krsi-go-raksya-vanijyam vaisya-karma svabhava-jam [Bg. 18.44]. The vaisyas must be engaged in producing food grains, but they are not interested. They are interested for opening factories for bolts and nuts and tires, Goodwheel tires, Goodyear tires. Now you eat tire and bolt nut. No, you cannot eat. You have to eat rice, and rice is ten rupees per kilo. That's all. Because no vaisya is producing food grains. This is the defect.

Bg. 4.13 Lecture; Bombay 2 April 197