Sentence:  All these processes eventually cause reversals which reverberate across <WSD>metamarkets</WSD> and down to lower-level markets, in which the instruments of exchange in a <WSD>metamarket</WSD> (say, credit and money) become less available to facilitate exchange, thereby sending the lower market into instability or at least retraction. 
Meaning of the word marked with <WSD> tags:  A market that trades in the medium of exchange of a lower-level market, such as money, derivatives, or credit.