In the early post-war years, inflation was growing at an alarming rate, but the government simply printed more currency to pay debts. By 1923, the Republic claimed it could no longer afford the reparations payments required by the Versailles Treaty, and the government defaulted on some payments. In response, French and Belgian troops occupied the Ruhr region, Germany's most productive industrial region at the time, taking control of most mining and manufacturing companies in January 1923. Strikes were called, and passive resistance was encouraged. These strikes lasted eight months, further damaging both the economy and society.