Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
It's that easy. We know that the small portion of Wendy's chili isn't technically "free" if you're needing to make an order of at least $5, but in this economy? We'll take what we can get. Buy a couple of drinks to partner with your chili. Buy a burger and have the chili as a starter. Do what you've got to do — Wendy's chili is a solid option at anytime of the day.
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