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A line slopes steadily, a spring bounces proportionally, and simple equations yield clear solutions. However, the real world is rarely so linear. Linear models often fall short when dealing with complex systems, where cause and effect are not neatly proportional.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.