Final answer:
Direct marketing channel results in the lowest out-of-pocket marketing expenses.
Step-by-step explanation:
The type of marketing channel that results in the lowest out-of-pocket marketing expenses for a manufacturer is a direct marketing channel. In this channel, the manufacturer sells their products directly to the consumers without involving any intermediaries. This eliminates any costs associated with intermediaries such as wholesalers or retailers, resulting in lower marketing expenses as a percentage of sales.