Great article about the Porters and the Formula Family

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https://www.tradeonlytoday.com/post-type-feature/a-successful-formula?mc_cid=a0eba4da97&fbclid=IwAR2fSIlVgJn1ySLScQWb7lm8TaQKCwUUvsTdCW3pF_k0LtY4uyTwk_fS3OM