Over the past decade, the restaurant industry in the country of Spiessa has experienced unprecedented growth.

Argument

Over the past decade, the restaurant industry in the country of Spiessa has experienced unprecedented growth.  This surge can be expected to continue in the coming years, fueld by recent social changes: personal incomes are rising, more leisure time is available, single-person households are more common, and people have a greater interest in gourmet food, as evidenced by a proliferation of publications on the subject. 

Answer

While the author argues that growth of restaurant industry in Spiessa seems to be lasting in next year due to some social changes, some significant factors should be considered are omitted. Since statistical data is unavailable, and social changes mentioned cannot be unconditionally concluded as the industry's expansion, this argument needs to be more sophisticated. 

To begin with, statistical evidence, though the author states that rise of incomes, more leisure time, and the number of households with a single contributes to restaurant growth, is not mentioned.  Without specific data with reasoning of statistical method, it has be doubted its validity.  For example, this argument based on a statistical data may come from a questionnaire applied to only 1% of population in the country, which is really not enough to conclude tendency and trend.  According to the author, personal incomes are rising, people have more leisure time, and living alone is more common but they have to be proven majority of generations in Spiessa has same trend by showing how the author has led out this supporting content. 

Another point to be tackled with is that those social changes cannot always be led to boost the restaurant industry.  More income and more leisure time may make people have more oversea trip, single households may buy more lunch packs at a grocery, or more gourmet publication may be caused by severe competition among magazine companies to get more subscribers from ordinary citizens without any typical hobby.  To connect reasoning of social changes and conclusion of restaurant's increase, the author must analyze what roles each social change takes for more restaurants trend. 

In conclusion, the author's argument misses several significant explanations such as statistical evidence to strengthen social changes mentioned and detail analysis of how each social change works out to restaurant's growth.  If those points are well addressed within the article, the author can be more convincing with his idea.