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In page Dot-com bubble:

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The dot-com bubble burst in 2000, causing numerous startups to fail after depleting their venture capital without becoming profitable.[1] However, some, notably online retailers like eBay and Amazon, survived and later became highly profitable.[2][3] Traditional retailers also began using the web as a supplementary sales channel. While many online entertainment and news sites collapsed when funding ended, others endured and eventually became self-sustaining. The sites that persevered had two things in common: a sound business plan, and a niche in the marketplace that was, if not unique, particularly well-defined and well-served.[citation needed]