Anyone have any idea what authenticators typically charge auction houses for these en masse authentications? Do they do it by the total number of lots, number of pieces, by the hour, by the day? Clearly it's not equivalent to adding up their standard rate for each individual signed item, but I'm just curious as to how they go about it.
If there's a previous thread that addresses this, I'd be happy for a point in the right direction. There's so much bashing and discussion of TPA's that it's hard to do a search for it.
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