MoneySupplyTax.sol

contract MoneySupplyTax is Coin {

    address taxCollector;
    uint taxRate;
    mapping(address => uint) taxDeclared;
    
    function enforceTax(address _account) internal {
        uint undeclared = taxrate**(block.timestamp - taxDeclared[_account]);
        balanceOf[_account] *= undeclared;
        if(_account == taxCollector) balanceOf[_account] += totalSupply - totalSupply*undeclared;
        taxDeclared[_account] = block.timestamp;
    }
    function payment(address _to, uint _amount) public {
        enforceTax(msg.sender);
        enforceTax(_to);
        transfer(_to, _amount);
    }
}