To be long of the market. Related to To be long of the market: Long position. (Stock Exchange) to hold stock for a rise in price, or to have a contract under which one can demand stock on or before a certain day at a stipulated price; - opposed to short in such phrases as, to be short of stock, to sell short, etc.
We need to be long.
Necesitaría saber qué es esto en español. "Operar en largo"?