Some are fixed while others are variable. Some of the variable factors include seasons or events and environmental changes. For example, fashion trendsetters and tastemakers in the media and entertainment industry or in the world of sports celebrities might reveal a preference for green blouses over blue ones. Consumers are likely to be influenced by these trend-setters, thus purchasing more green t-shirts than blue t-shirts. This implies that the demand for blue blouses will decrease significantly in the same way as their supply (Adil, 2006). Likewise, the environment and seasons tend to influence the supply and demand of a significant number of goods. For example, jackets and warm clothing will be requested and provided more during the winter than in the summer, while ice cream will be requested during the summer but not in the winter. Likewise, the demand and supply of beverages will be higher during the holiday season than other seasons. These examples imply that there are variable factors that can easily influence the supply and demand of various goods either negatively or in favor of an organization. Some of these factors are predictable and therefore measures can be taken to address them, while others are unpredictable and therefore are likely to impart negative effects to the organization (Fisher,