Yes, a Jain person can become a billionaire.

In Jain Dharma, wealth itself is not forbidden. What matters is how it is earned, used, and attached to. Jain teachings emphasize:

• Ahimsa: earning without harming living beings
• Satya: honesty in business
• Aparigraha: non-attachment to wealth
• Dana: charity and right use of money

A Jain can be very wealthy, even extremely rich, if that wealth is acquired through ethical means and is not accompanied by greed, violence, dishonesty, or attachment. In Jain thought, the real concern is not the amount of money, but the bondage caused by attachment to money.

So the Jain ideal is not poverty for its own sake, but responsible, non-violent, and detached living.