In the context of the input sentence, determine the relationship between 'Starbucks' and 'coffee'.
Options: distributed by, subsidiary, chairperson, product/material produced

But when coffee prices drop unexpectedly, as they did this year, these advance strategies can have some negative short-term consequences: It's likely that Starbucks paid more than the current spot market price for coffee stocks, which would be reflected in future financial statements.
product/material produced