Stocks were modestly positive last week following three straight weeks of negative performance. Markets crawled back following an ugly Monday in which the S&P 500 suffered its worst loss in more than seven months. For the week, the S&P rose 0.9% while the Dow Jones Industrial Average added 0.7%.

Equity markets climbed higher for a second straight week, extending a rally that began November 16. For the week, the S&P 500 rose 0.6% and the Dow Jones Industrial Average gained 0.2%. In the post-mortem on Q3 earnings season, much has been made of the first quarter of negative earnings growth in three years. However, analysis by Morgan Stanley reveals an even more disturbing picture of corporate America: just 10 companies in the S&P 500 delivered 88% of the indexs earnings growth. Of those 10, four accounted for more than half and Apple alone made up nearly one-fifth of the indexs growth.

Institutional and individual investors are at an uncertain juncture, waiting to see what the next shoe to drop is. With an important series of events occurring soon, such as the US Presidential election this fall and the fiscal cliff facing the US at years end, investors may need to wait to get more clarity on the market outlook.

Consumers have long been the cog behind the American economic engine. After suffering a terrible fate in 2008, there was a long, slow build to post-recession normalcy. Consumer balance sheets are in a better place, but remain tenuous and suggest there continues to be a long distance to travel before we can once again depend on the American consumer to be the buyer of last resort.

Markets posted their best returns of 2012 last week as investors anticipated additional policy action from global central banks. A series of events during the week heightened optimism that central banks would once again step in to support financial markets. In a Wednesday release, the European Central Bank did not cut its policy rate, but ECB President Mario Draghi said the bank was ready to act in response to the deteriorating state of the Eurozone.

During an especially difficult week, global equity markets were deep in the red, as the S&P 500 Index lost 3.2% and the Dow Jones Industrial Average fell 3.3%. There was no shortage of disappointing data during the course of the past week, ranging from weakness in the ISM manufacturing survey to an underwhelming May labor market report. It was such a bad week, in fact, that Bespoke Investment Group found that 18 of the 21 economic indicators released in the U.S. fell short of expectations.

Markets rebounded last week after a two-week slide. The S&P 500 and Dow Jones Industrial Average rose 1.7% and 0.7%, respectively, in a choppy trading period. Discussion of a potential Greek exit from the Eurozone rattled investors, while economic data in the US was modestly positive.

Worries over the European sovereign debt crisis worsened this week as Greeces political instability increased concern that the country could depart the Eurozone. Greece saw a virtual run on its banks during the week, as depositors withdrew 1.2 billion in two days on fears of massive devaluation from a return to the drachma. While this represented just 0.75% of Greek deposits, it foreshadows a potentially larger crisis if a Greek Eurozone departure becomes imminent.

Strength in the corporate sector since the recession ended has been well documented. In the face of general economic malaise, record profits have been achieved through aggressive cost-cutting and low financing costs. This phenomenon has been one of the major pillars propping up the markets (with the other being central bank policy). Now with Q1 earnings season all but over, it is not unreasonable to question whether that corporate strength is fading. Initial impressions of first quarter earnings season were very favorable after the first big wave of earnings releases.

Market sentiment has oscillated quite rapidly in recent months on the heels of dramatic market intervention by the ECB and shifting views of global economic stability. Sentiment is likely to remain unstable in the months ahead as investors grapple with any number of events, from elections in Europe and the US to the end of recent monetary easing efforts domestically. While markets have rallied substantially over the past six months, retail investors are maintaining a somewhat neutral view on their allocations.

For most of the past two years, investors have been pre-occupied with the fiscal catastrophe in Europe and with good reason. However, the relative health of the worlds second largest economy arguably deserves more headline space. A year ago, Chinas stock market led the broader emerging markets down due to pervasive inflation concerns. Official figures reached as high as 6.5%, and some reports of pork and other food price inflation reached double-digit levels. Chinese authorities were forced to slow down the pace of their economy by raising bank reserve ratios and key lending rates.

The continued march higher in oil prices is filtering its way down to consumers in a less-than-favorable way. By the end of the week, the average price for a regular gallon of gas was $3.65, 30 cents higher than the price one year ago. Consumers are all too familiar with the taxing effect of higher gas prices, particularly given the extreme run up early last year. Interestingly, the number of Google searches for gas prices recently overtook those for Greece, suggesting that the domestic economic situation is trumping consumers concern about an overseas shock.