Major economic crises are inevitably also structural milestones. There is no simple return to a pre-crisis normalcy. Something changes permanently. As we learned in 2009, patterns of expectations and demand take a new shape.

The current economic crisis is not simply a blowback effect of financial globalization. Financial globalization misfired because it took a bet on a type of economy that was becoming unsustainable. During the past quarter century, but especially over the five years leading up to 2008, the world seemed to revolve around the American consumer.

American-style consumption offered a new model of economic development. It inspired widespread emulation. Over the course of a few decades, major city centers across the world began to resemble each other much more closely, with the same brands, designs, and lifestyles. Consumption or, more precisely, consumerism, appeared to be globalized.

American universities delivered new curricula based on studies of consumption and consumerism. In the aftermath of the terrorist attacks of September 11, 2001, then US president George W. Bush advised Americans not to allow the trauma of the attacks to interfere with their ordinary shopping, and implied that buying had become a patriotic duty and virtue. The US had become the world's consumer of last resort.

The post-2007 crisis was not simply a financial affair. It began as a result of weakness in a specific sector - residential mortgages - after a bubble in home prices allowed many Americans to borrow massively, and often disastrously, against the putative value of their equity in order to finance purchases.

The global imbalances that many people view as being at the root of the problem reflected savings rates of near zero in the US, as well as in those economies that seemed best to emulate the American model - the UK, Ireland, and Spain.

In the course of the crisis, these debt-ridden economies' consumers abruptly changed their purchasing habits. Savings rates shot up. Spending on automobiles ground to a halt, until government stimulus programs in many countries revived it. But schemes such as public subsidies for scrapping old and fuel-inefficient cars simply led many people to re-schedule their purchases. The automobile market was rescued in 2009 at the expense of sales in 2010 and subsequent years.

The crisis also revealed the extent of the massive overcapacity in the US retail market, with estimates that at least one-fifth of American shopping malls would be forced to close. The response to the crisis will be a hastening of the movement toward online purchases, in which physical location is no longer a preeminent part of shopping decisions.

High-value and luxury brands were brutally hurt by a wave of deep discounting in the last quarter of 2008. The aura of a brand is easily destroyed. One reaction has been to look for radically new marketing strategies, as in the case of the up-market Jimmy Choo brand of women's shoes, now to be sold in a simpler guise by the low-price mass retailer H&M.

Such recovery as there has been in the luxury market has been largely limited to so-called affordable luxuries - shoes, handbags or ties, rather than yachts or fast cars. Purchases of these relatively low-cost items can be regarded as the withdrawal symptoms of the world's consumer binge.

The consumer age was the product of two previous crises. The Great Depression of the 1930s was interpreted as the result of inadequate consumption, of poverty in the midst of plenty. Governments took on the responsibility of stabilizing and organizing consumption on a wider level.