Google, which yesterday had its particular “black Thursday” on Wall Street by the publication of early results surely will not forget this old lesson. The Silicon Valley company breached, apparently inadvertently, the unwritten rule that the accounts should not be known as the Stock bustling with activity. And even less when the figures are lower than expected by experts, which in trading parlance is known as the “consensus of analysts’, a variable that can make a company’s securities crumble in a few hours, although who obtained benefits (benefits millionaires, for the technology giant).