Does your plastic mayonaisse container have ridges running around its middle underneath the label?

Mine does. There are 4 indented rings spaced about 2 cm (~½ inch) apart . Why are they there? At first I thought it was to better grip the container but I noticed that the label covers them.
I use a spatula to get spreadable food, (mayo, jelly, peanut butter) out of containers. It does a better job than a knife or spoon and, in general, gets it all so there is no waste. The ridges on the Mayo container prevent the spatula from reaching the entire surface. Is this clever packaging?
I did a test to see how much was left in the jar after doing the best job I could do with the spatula. The result was 17.6 grams left behind out of an 800 gram container (roughly 30 oz.) That is 2.2% wasted. Is that intentional? The mayo manufacturer sells 2.2% more mayo. Customers need to buy it 2.2% more frequently. The retailer sells 2.2% more than needed.
It seems everyone benefits except the garbage collector on a fixed fee schedule and the consumer who loses about 7 cents for every $3.00 jar.
Why do you think the ridges there? Do you try to get all the mayo out before recycling the container?
Do you realize that over a period of 10 years we are throwing out about $2.50!