What currency do they spend in Indonesia?
Indonesian rupiah
Following the issuance of Presidential Decree No. 31 of 5 September 2016, Bank Indonesia introduced seven new banknote designs featuring national heroes:During colonial times, the currency used in what is now Indonesia was the Netherlands Indies gulden. The country was invaded in 1942 by Japan, which began printing its own version of the gulden, which remained in use until March 1946. The Netherlands authorities and the Indonesian nationalists, who were fighting for independence, both introduced rival currencies in 1946 with the Dutch printing a new gulden, and the Indonesians issuing the first version of the rupiah on 3 October 1946. Between 1946 and 1950 a large number of currencies circulated in Indonesia, with the Japanese gulden still remaining prevalent alongside the two new currencies and various local variants. This situation ended when the federal government, now in complete control following the Dutch recognition of its independence, initiated currency reforms between 1950 and 1951. The rupiah was declared the sole legal currency, with other currencies being exchanged for rupiah at rates which were often unfavourable to the holders.
History of the Indonesian rupiah
The accord provided that The Netherlands was to retain economic influence over the republic until Indonesia had paid the debt run up by NICA in fighting the war with Indonesia. It was agreed that private Dutch-owned De Javasche Bank was to be restored as the central bank of Indonesia, despite resentment among Indonesian nationalists, the Indonesian-established BNI becoming a development bank.