Bankruptcy is a legally declared inability or impairment of ability of an individual or organization to pay its creditors. Creditors may file a bankruptcy petition against a debtor ("involuntary bankruptcy") in an effort to recoup a portion of what they are owed or initiate a restructuring. In the majority of cases, however, bankruptcy is initiated by the debtor (a "voluntary bankruptcy" that is filed by the bankrupt individual or organization).

In ancient Greece, bankruptcy did not exist. If a father owed (since only locally born adult males could be citizens, it was fathers who were legal owners of property) and he could not pay, his entire family of wife, children and servants were forced into "debt slavery", until the creditor recouped losses via their physical labor. Many city-states in ancient Greece limited debt slavery to a period of five years and debt slaves had protection of life and limb, which regular slaves did not enjoy. However, servants of the debtor could be retained beyond that deadline by the creditor and were often forced to serve their new lord for a lifetime, usually under significantly harsher conditions.