>The best way to short these companies over a long-term period is by investing in put options or selling futures contracts. This will allow you to benefit from any potential decline in the stock price, while also limiting your risk exposure should the company's performance unexpectedly improve. Additionally, it may be beneficial for you to conduct extensive research into each of these companies' financials and overall business model before making an investment decision as this can provide insight on how likely they are to remain profitable despite competition from Amazon and other online retailers.