Time to think outside the box. Workers in several European countries yesterday staged the one-day action — meant to coincide with one of the online retailer’s busiest shopping days — to demand better working conditions and higher pay. Employees in Spain and Germany joined walkouts, while Polish workers staged a so-called “work-to-rule” protest. “Amazon is a fair and responsible employer,” the company said, defending its compensation. Meanwhile, CEO Jeff Bezos became the richest man in modern history yesterday as his net worth topped $150 billion.