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The Balmer Series of lines in the hydrogen atom was very important in the history of physics and astronomy. What made it so important?
Selective Demand
Demands aimed at persuading customers to buy specific brands or products instead of general product categories.
Primary Demand
The overall demand for a product category or industry, as opposed to demand for a specific brand within that category.
Generic Demand
The overall demand for a category of products or services, not linked to any specific brand or model.
Product Class
A broad category of products that serve a similar function or are targeted at a similar customer segment.
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