The other tactic is emphasizing container sizes that haven't been high-volume products in the past. For example, vending machines that sell canned drinks are an increasingly rare species - most of the new models are designed to sell larger plastic bottles, presumably since consumers have less specific ideas of what they should cost. Chocolate bars are now frequently sold in small 100-gram packages and larger double-bar packages.
What ever happened to 'make something people want?' I was in the ice cream aisle a couple days back and it was downright depressing.<p>[edit: <i>quantity</i> is very important to me when it comes to ice cream :)]
The Consumerist has a lot of articles about this, grouped under the title "Grocery Shrink Ray" (<a href="http://consumerist.com/search/grocery%20shrink%20ray/" rel="nofollow">http://consumerist.com/search/grocery%20shrink%20ray/</a>).