When a Firm Offers Advertising Allowances to Firms Further Along

When a firm offers advertising allowances to firms further along in a channel,what is the likely benefit it gets?

A) They encourage advertising or promoting of the firm's products locally.
B) They involve intermediaries and producers sharing in the cost of ads.
C) They allow for coordination and integration of ad messages in the channel.
D) They set the allowance amount as a percent of the retailer's actual purchases.
E) They offer incentives that encourage retailers to stock up on a product.