This paper deals with the Tunisian foreign exchange market microstructure. The issue is the identification of pricing elements on this market. The GMM is commonly used to identify the components on which the Tunisian market maker focuses to determine his bid-ask spread for the TND/USD and the EUR/USD currency pairs. This study shows out that some of the elements making up the bid-ask spread predicted by the theory are considered by the Tunisian trader when fixing his pricing strategy. Yet, the bid-ask strategy differs from a transaction currency to the other.