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2. Volatility (finance) - Wikipedia

   en.wikipedia.org/wiki/Volatility_(finance)

   In finance, volatility (usually denoted by "σ") is the degree of variation of a trading price series over time, usually measured by the standard deviation of logarithmic returns . Historic volatility measures a time series of past market prices. Implied volatility looks forward in time, being derived from the market price of a market-traded ...

3. Binomial options pricing model - Wikipedia

   en.wikipedia.org/wiki/Binomial_options_pricing_model

   The binomial pricing model traces the evolution of the option's key underlying variables in discrete-time. This is done by means of a binomial lattice (Tree), for a number of time steps between the valuation and expiration dates. Each node in the lattice represents a possible price of the underlying at a given point in time.

4. Free Shipping Day - Wikipedia

   en.wikipedia.org/wiki/Free_Shipping_Day

   In 2011, Free Shipping Day became a billion-dollar shopping holiday with $1.072 billion in sales, followed by $1.01 billion during Free Shipping Day 2012. [6] In 2013, Knowles changed the format of Free Shipping Day to only include merchants that could waive all minimum order requirements and guarantee delivery by Christmas Eve. [7]

5. Zazzle launches in the UK | TechCrunch

   techcrunch.com/2008/11/13/zazzle-launches-in-the-uk

   Zazzle.com, the on-demand e-commerce shop that allows users to create and sell their own products has launched a ... Zazzle’s offering free shipping on all UK and EU orders over £30 until the ...

6. Zazzle - Wikipedia

   en.wikipedia.org/wiki/Zazzle

   Zazzle. Zazzle is an American online marketplace that allows designers and customers to create their own products with independent manufacturers (clothing, posters, etc.), as well as use images from participating companies. Zazzle has partnered with many brands to amass a collection of digital images from companies like Disney, Warner Brothers ...

7. Amazon drops its free shipping minimum to $25, undercutting ...

   techcrunch.com/2017/05/09/amazon-drops-its-free...

   8:22 AM PDT • May 9, 2017. Comment. Amazon is fighting back against Walmart by dropping its free shipping minimum requirement down to $25. The move comes after a number of challenges by Walmart ...