2025-01-01 starting balances
    assets:cash               100 USD            =  100 USD
    assets:bank:checking     1000 USD            = 1000 USD
    assets:broker:usd        1000 USD            = 1000 USD
    assets:broker:aaa           1 AAA @ 1.20 USD =    1 AAA @ 1.20 USD
    liabilities:credit card  -400 USD            = -400 USD
    equity:start

2025-01-01 pay rent
    assets:bank:checking
    expenses:rent             800 USD

2025-01-02 salary
    revenues:salary
    assets:bank:checking     1000 USD

2025-01-03 pay off credit card
    assets:bank:checking
    liabilities:credit card   400 USD = 0 USD

2025-01-04 shopping
    assets:bank:checking
    expenses:food             200 USD
    expenses:supplies          50 USD