I disagree with the government increase income tax for rich people that social welfare will increase because they have many way for use that tax useless such as if the government can corruption so revenue from tax doesn't be used for public goods and infrastructure that social welfare will not increase anymore or the government use that money from tax for rich people to develop infrastructure in wrong way it will not increase any social welfare to. That mean if we have the useless government although we can gain a lot of income tax from rich people or anything it will not increase social welfare. On the other hand if rich people pay tax normally they have money more than this they can pay for goods or services more than it to and it will increase consumer surplus if consumer surplus have increase that mean social welfare will increase to. Finally if the government say if increase income tax from rich people social welfare will increase it doesn't true anymore.