according to a noted marketing author, Philip Kotler, involves “work”, e.g., American sellers of pharmaceutical products have to search buyers, either individuals or groups, identify their needs, produce quality products within or above the standards set fort by BFAD, drum-up a well balanced promotions mix, formulate pricing strategies, ensure availability and visibility of product lines in target pharmaceutical sales outlets, and above all, render services even prior, during and after the sale is consummated.