Yes, it replaces all other forms of social welfare. Here in the US at least, the welfare system is problematic enough (bureaucratic snafus, etc) that a robust

Yes, it replaces all other forms of social welfare. Here in the US at least, the welfare system is problematic enough (bureaucratic snafus, etc) that a robust private charity exists to back things up. So there are private soup kitchens, food banks, etc. Someone who used up all their basic income would need to turn to friends, family, church, or these private charities.