  function getTokenBalances()
    external
    view
    returns (uint256 maltBalance, uint256 collateralBalance)
  {
    uint256[] memory traderIds = activeTraders;
    uint256 length = traderIds.length;

    for (uint256 i; i < length; ++i) {
      SwingTraderData memory trader = swingTraders[activeTraders[i]];
      maltBalance += malt.balanceOf(trader.traderContract);
      collateralBalance += collateralToken.balanceOf(trader.traderContract);
    }
  }
