In Fallen London, there are a wide variety of currency-like items (indeed, it's part of the metaplot). Most of these can be converted into something else: many Whispered Secrets can be converted into a smaller number of Cryptic Clues, which can then become an even smaller number of Appalling Secrets, which can then convert further. For most of these conversions, they remain the same type: Whispered Secrets, Cryptic Clues, and Appalling Secrets are all Mysteries, for example.
The trouble is that some of these conversions result in items of different types.
For instance, Journals of Infamy (a Mysteries item) can be converted to Correspondence Plaques (a Wild Words item). This makes it difficult to tell whether I can get what I want. If I want, say, Favours In High Places, do I need to sell my stuff at the Bazaar in order to buy a different base-level item and then convert upwards (which is a bit inefficient), or do I have items already that I can convert into the final product?
Is there a chart out there of how all of these currency-like items are converted into each other, and at what ratios?