How much income do you need to sponsor a green card?

I'm curious to understand the financial requirements for sponsoring a green card. Can you please elaborate on how much income is typically needed for someone to be eligible to sponsor a relative or employee for permanent residence in the United States? Are there any specific guidelines or formulas that the government uses to determine this amount, and how do they account for factors such as family size or location? I'd appreciate any insight you can provide on this topic.