As was already mentioned several times, a module should be easily replaceable. Even if there are several other modules dependent on it, having a clear, public API enables us to replace the module by a new implementation. There are also some other considerations, e.g. related to bootstrapping of the module, but the clear API is by far the most important one.
The U.S. benchmark for crude oil rose from about $67 to $71 per barrel on March 2. But it started the year at $57 per barrel and has steadily risen because of escalating U.S.-Iran tensions.
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