Type Definition frame_support::traits::tokens::fungible::DebtOf

pub type DebtOf<AccountId, B> = Imbalance<<B as Inspect<AccountId>>::Balance, <B as Balanced<AccountId>>::OnDropDebt, <B as Balanced<AccountId>>::OnDropCredit>;

Imbalance implying that the total_issuance value is less than the sum of all account balances.