Open interest is the number of contracts held by traders in active positions — they're not closed or expired. For Lithium Carbonate CIF CJK (Fastmarkets) Futures this number is 75.00. You can use it to track a prevailing market trend and adjust your own strategy: declining open interest for Lithium Carbonate CIF CJK (Fastmarkets) Futures shows that traders are closing their positions, which means a weakening trend.