Could you explain how the cost of products are related to the cost of advertisements?

你能解释一下商品成本和广告成本的关系吗？

广告和价格的关系 - SpeakingMax英语口语达人

The book gives example after example of software that came and went, at one time dominating the market but then giving way to a better newcomer: throughout, reviewers' ratings of the products explain market-share.

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Now the 24-person startup is launching its first products to explain why investors were so interested.

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Then he added computer magazines to explain his products to potential buyers.

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