"In general, people are not as concerned as they were a decade ago about regulating their intake of red meat and fatty cheeses. Walk into Heart's Delight, a store that started selling organic fruits and vegetables and whole-grain flours in the 1960's, and you will also find a wide selection of cheeses made with high butterfat content. Next door, the owners of the Good Earth Cafe, an old vegetarian restaurant, are still making a modest living, but the owners of the new House of Beef across the street are millionaires."
The argument claims that people are not as concerned as they were a decade about regulating their intake of red meat and fatty cheeses.This argument doesnt consider the complete picture of causes and effect and assumes few causes to be the sole cause of effect that people are not concerned as they were before . Hence, the argument is weak and unconvincing.
First, the argument readily assumes that the store "Walk into the HEart's delight" expanded its market base from organic fruits and vegetables to chesses made with high butter fat because more people now are buying these high fat cheeses than before. So the argument assumes that this is one of the causes for the effect that people are not regulating their intake of food as they were earlier. This assumption is weak as it doesn't consider various other factors (causes) for people to be interested in the high fatty foods. Recent health articles published suggest that fatty cheeses are good source of calcium and vitamin D required for maintaining healthy bones. People of a decade might not be as aware as of people today are about the benifits of fatty cheeses and so people a decade earlier regulated their cheese intake by assuming that fatty cheeses are not healthy. This argument doesnt consider that people now are more well aware and more concerned about their health and adding these fatty cheeses to their diet.
Secondly, the argument assumes that "walk into the hearts delight" store added these fatty cheeses because the revenue from organic foods wasnt sufficient to maintain the store. This assumption didnt consider that store might wanted to expand its market base to departments other than organic fruits & vegetables inorder to generate more revenues and more profits.
Third, the argument mentions that owners of "Good earth cafe", a vegetarian restaurant, are making a modest living while owners of "new house beef" became millionaires. This argument doesnt explain whether the "new house beef" serves organic food or vegetarian food that is a healtheir option than the vegeterian food served at "good earth cafe'. The quality of food is not compared at both the restaurants. The argument just assumes that "new house beef" became popular for its red meat served. Also, this argument doesnt compare the taste of food at both restaurants. If the taste of food at "good earth cafe" declined and taste at "new house beef" is exceptional, obviously the "new house beef" will have a greater demand and every chance for the owners to become millionaires.
In conclusion, the argument is not complete for the above-mentioned reasons and is therefore unconvincing. It could be considerably strengthened if the author had clearly mentioned all the relevant factors for the effects of store carrying fatty cheeses or consider all relevant reasons for some restaurants to become profitable while some remain the same.