If you show same data in meaningful way e.g. the number of typical shopping baskets the "Cash in Hand" can buy we see different picture...https://twitter.com/avtarsehra/status/818203150045892608 …
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Yes that's one factor for sure, so large legal purchases may easily be done in cash.
Excluding occasional large cash purchases 'cash in hand' could mostly be dependent on cost of living *just a guess*
would be interesting to investigate further.
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