The Oxford English Dictionary, 2nd ed. defines concentration camp as
a camp where non-combatants of a district are accommodated, such as those instituted by Lord Kitchener during the South African war of 1899-1902; one for the internment of political prisoners, foreign nationals, etc., esp. as organized by the Nazi regime in Germany before and during the war of 1939-45 The English term "concentration camp" was first used to describe camps operated by the British in South Africa during the 1899-1902 Second Boer War. Allegedly conceived as a form of humanitarian aid to the families whose farms had been destroyed in the fighting, the camps were used to confine and control large numbers of civilians as part of a Scorched Earth tactic. A report after the war stated that 27,927 Boers (of whom 22,074 were children under 16) and 14,154 black Africans died as a result of diseases developed due to overcrowding, inadequate diets and poor sanitation in the camps. In all, about 25% of the Boer inmates and 12% of the black African inmates died. The term "concentration camp" was coined at this time to signify the "concentration" of a large number of people in one place, and was used to describe both the camps in South Africa (1899-1902) and those established by the Spanish to support a similar anti-insurgency campaign in Cuba (circa 1895-1898 ), although at least some Spanish sources disagree with the comparison .
Use of the word concentration comes from the idea of concentrating a group of people who are in some way undesirable in one place, where they can be watched by those who incarcerated them. For example, in a time of insurgency, potential supporters of the insurgents are placed where they cannot provide them with supplies or information.
The term concentration camp lost some of its original meaning after Nazi concentration camps were discovered, and has ever since been understood to refer to a place of mistreatment, starvation, forced labour, and murder. The expression since then has only been used in this extremely pejorative sense; no government or organization has used it to describe its own facilities, using instead terms such as internment camp, resettlement camp, detention facility, etc, regardless of the actual circumstances of the camp, which can vary a great deal. This and more you can find in Vikipedia More about concentration camps in the 20th century you will find here: www.spartacus.schoolnet.co.uk/GER…
Needless to add there are those who consider modern Fema Camps as "potential" concentration camps.
The BIS, APSA and IOR have never accounted for WWII era gold transfers nor have Portugal, Spain, Turkey, and Argentina. The confusuion is that a lot of this was not Jewish gold but gold looted from central banks, banks, and private depositories and included a lot of bullion coins. There were further large transfers immediately post war through the IOR and APSA from Hungary, Czechoslovakia, Romania and elsewhere to keep funds from falling into the hands of Stalin.
Jewish funds were significant among looted assets maybe even the majority but the assets would have included gold and funds from Roma (who kept their assets in gold coins), enemy citizens and companies, banks in occupied countries, anyone denounced as a freemason, political opponents, former regimes and elities and royal families associated with them, political parties, other minorities like Serbs in Croatia and Bosnia.
War and political upheavel create a lot of opportunity for asset transfer.
No, I doubt the Jews were the largest bank depositors in pre war Europe - while these figures seem low percent wise - the Jews did not seem to be all that statistically signifacent except in Poland, Romania, USSR, and Hungary.