Fig. 3
The transaction stream \( \mathcal {T} \) can be divided in four substreams: transactions between member accounts \(\mathcal {T}_{MM} \), between member and anonymous accounts \( \mathcal {T}_{MA} \), between anonymous and member accounts \( \mathcal {T}_{AM} \), and between anonymous accounts \( \mathcal {T}_{AA} \). Left - Repartition of the transactions between the different transaction substreams. Right - Repartition of the exchanged amounts between the different transaction substreams. Notice that, although \( \mathcal {T}_{AM} \) represents about 45% of \( \mathcal {T}\) in terms of number of transactions, it only adds up to 12.4% of the exchanged volume