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Ports, extremely expensive not only to develop, but also to maintain, earn revenues through fees paid by shipping companies exporting or importing goods through the port. Ports in countries that are completely self-reliant in terms of the manufacturing and production of commodities, raw materials and resources in general must generate lower incomes than ports of a similar size in countries that produce only a portion of their goods and resources since the latter are more likely to enjoy higher levels of activity than the former, and in turn, earn more income from fees being paid.
Which of the following, if true, casts the most doubt on the argument's conclusion?
This answer choice neither weakens nor strengthens the conclusion. The conclusion compares between the financial situations of different kinds of ports, but this answer choice discusses different countries.
This answer neither weakens nor strengthens the conclusion. The argument focuses on the earnings of two kinds of ports. The reasons for which ports import and\or export are irrelevant since they have nothing to do with how much they earn when they export and\or import.
This answer choice neither weakens nor strengthens the conclusion. Since the information in this statement applies to both kinds of port while the conclusion compares between the ports, it cannot help us attack the argument's position.
This answer choice strengthens the conclusion. If ports that deal in two-way trading attract business and investors than they are definitely likely to earn more than those that mostly handle export.
This answer choice attacks the argument's assumption. If export fees include an extra commission, this makes them higher than import fees. This means that a port that deals mostly in export will earn more than one that deals with both export and import, perhaps even if it accommodates lower levels of shipping activity.