The amount of any credit card depends on the effective income provided by the individual during the application process and the value of the asset guarantee. The credit limit of a credit card is positively related to the applicant's income and secured assets, that is, the higher the income and secured assets, the higher the credit limit. Therefore, the applicant must provide proof of income and statement of asset guarantee. Asset guarantee includes fixed assets such as real estate and automobiles, as well as current assets such as savings and bonds.