When all producers in an industry combine to advertise their product instead of each firm advertising its own brand, this is referred as?

When all producers in an industry combine to advertise their product instead of each firm advertising its own brand, this is referred to as "mass advertising". Mass advertising is a marketing technique in which companies or businesses pool their resources to promote their industry as a whole rather than their individual products. The objective is to increase overall demand for their products and create a positive image for the industry as a whole. This strategy is often used in industries where there are many small producers who do not have the resources to advertise individually, or where it is more effective to promote the industry as a whole.