The merchant side of the equation is just as interesting.
Wall tells me that the pair left the company partly because they believed that the technological development needed to be happening on both sides of the register, and they did not feel Google was the right place to develop the merchant side of the equation.
A credit in the amount of the charge is applied to the card holder's account so the merchant is left out of the equation completely.
Unlike the standard 3SLS, the GMM estimator allows for heteroskedasticity in addition to cross-equation correlation where some variables (as merchant acceptance in our case) may appear both as exogenous and (lagged) endogenous variables in the different equations (Hansen 1982; Wooldridge 2002).
As for cross-equation restrictions, the error terms of consumer and merchant transactions volumes for POS and ATMs are expected to be correlated across the equations.
From the other side of the equation, business owners can manage everything instantly from the merchant portal.
He explained to me that in commerce startups, there's the challenge of how to solve the equation in retail of being good for consumers, merchants, and for the business.
Now, by becoming web merchants instead of, or in addition, to storefront operators, the opportunity equation for these entrepreneurs has expanded exponentially.
And really, if you look at how much Square has evolved over the last year to include business directories, merchant dashboards and more, it's clear that transactions is just part of the equation in mobile payments.
Pro-tax advocates talk about how they'll make compliance so easy for web merchants, as if the amounts don't matter and customers aren't part of the equation.
