The first purpose is to pay for background checks and any costs that the immigrant might incur in the USA. (For example it would pay for deportation if the immigrant broke the law.)
The second is to serve as proof that the immigrant is enough in demand that the government should believe we get a net positive from their admission to the USA. And not exactly onerous proof - it is only a fraction of what has to be paid in salary and benefits.
Also note that this is only a partially baked proposal. I am sure that there are much better options than this, just as this is would be likely to work better than the current H1B program does.
The first purpose is to pay for background checks and any costs that the immigrant might incur in the USA. (For example it would pay for deportation if the immigrant broke the law.)
The second is to serve as proof that the immigrant is enough in demand that the government should believe we get a net positive from their admission to the USA. And not exactly onerous proof - it is only a fraction of what has to be paid in salary and benefits.
Also note that this is only a partially baked proposal. I am sure that there are much better options than this, just as this is would be likely to work better than the current H1B program does.