It looks like meaning #2 is more applicable than #5. That is, the closing list is more suggestive of "banking, borrowing, and investments" than of "banking, assets, and investments". Where is the quotation from?
Update 1 - Given the source[1] and given Optimal Cynic's remark associating 'credits' with 'credit unions', it appears neither #2 nor #5 above are applicable.
If the sentence is taken as calling for strict supervision of banks, credit unions, and investment companies, then the three elements of the list all are consistent with the next phrase, regarding "an end to speculation with other people's money."
[1] ¶12 of FDR's first inaugural address, as at www.bartleby.com:
Finally, in our progress toward a resumption of work we require two safeguards against a return of the evils of the old order; there must be a strict supervision of all banking and credits and investments; there must be an end to speculation with other people's money, and there must be provision for an adequate but sound currency.