The argument claims that America is losing its competitive edge relative to other countries, because on average Americans spend over a quarter of their leisure time shopping. Stated in this way the argument reveals examples of leap of faith, poor reasoning and ill-defined terminology, as well as fails to mention several key factors, on the basis of which it can be evaluated. The conclusion of the argument relies on assumptions for which there is no clear evidence. Hence, the argument is unconvincing and has several flaws.
First, the statement readily assumes that spending time shopping leads to loosing competitive edge. This statement is a stretch, it does not provide any details about where exactly America is losing the edge and how that is related to shopping, providing more details is required to make a connection, otherwise there will be doubts. For example, we are not told if Americans spend more time shopping then people from other countries. Clearly, we need relative data points to be able to make a comparison. The argument could have been much clearer if it explicitly stated that Americans spend more of their leisure time shopping, while people from other countries, spend similar or more time on personal and communal development.
Second, the argument claims that in order to counteract that trend, Americans should spend more time focusing on personal and communal development. This is again a very weak and unsupported claim as the argument does not demonstrate any correlation between community service and gaining competitive edge. To illustrate, though Americans spend quarter of their leisure time shopping, they might be spending another quarter pursuing educational advancement or participating in volunteer opportunities. While people of other countries spend less time in absolute value and gain competitive edge in a different manner, for example China is known for its rapid growth and competitive edge in many aspects, but that is gained through sweatshops and lower value of human life, which is not a good trade even for a competitive edge. IF the argument had provided evidence that Americans lose their competitive edge because of the reasons mentioned and nothing else, then the argument could have been a lot more convincing.
Finally, the argument raises questions that it does not answer, such as what will be an effect of decreased consumptions? It is known that consumption is an important factor of a growing economy and spending less time consuming goods will lead to a loss of jobs, another important questions in what sectors America is losing competitive edge? It is quite possible that America is gaining edge in a more important areas of economy and quality of life. Without convincing answers to these questions, one is left with an impression that the claim is more of a wishful thinking rather than substantive evidence.
In conclusion the argument is flawed for the above-mentioned reasons and is therefore unconvincing. It could be considerably improved if the author clearly mentioned all the relevant facts. In order to assess the merits of a certain situation, it is essential to have full knowledge of all the contributing factors. In this particular case author needs to provide more details on competitive edge and its importance, and how shopping is detrimental to it. Without this information, the argument remains unsupported and open to debate.