What are the long-term consequences of the Muhammad cartoon furor? I predict it is helping to bring on not a clash of civilizations, but their mutual pulling apart. This separation, which has been building for years, has dreadful implications. Signs of disengagement are all around. â€¢ Trade: Boycotts now exist in both directions. Even as the US government sanctions Iranian products, Iran's president Mahmoud Ahmadinejad says his government will "revise and cancel economic contracts" with countries where newspapers published the cartoons. Several Muslim countries have suspended trade with Denmark, while Muslim-owned stores in Canada have removed Danish products. The Pakistani medical association even announced a boycott of medicines from five European countries. â€¢ Consumer items: Muslims are increasingly replacing Western consumer items with their own. They purchase extremely modest Fulla and Razanne dolls rather than the busty Barbie. In France, Beurger King provides halal food, competing with Burger King, just as Mecca Cola takes the place of Coke and Pepsi. Al-Jazeera is starting an English-language channel to go against CNN and the BBC. â€¢ Financial investments: As a result of freezes on funds and the designation of terrorist entities, Muslims have moved large amounts of capital out of the West and invested these either in their own countries or in other places around the world, such as East Asia. Middle Eastern oil exporters before 9/11 annually put as much as $25 billion into American investments; since then, the amount is about $1 billion a year. â€¢ Emigration: 9/11 caused a significant increase in obstacles to Muslims traveling to the West, so fewer Muslim business executives, students, hospital patients, conference goers, and workers are reaching there. â€¢ Tourism: Islamist atrocities such as the murder of 60 Japanese, German, and Swiss tourists in Luxor in 1997 and the abduction of 32 German and other travelers in the Sahara in 2003 had already led some Westerners to avoid discretionary travel in the Muslim world. Cartoon-related violence has prompted a Danish advisory warning against travel to 14 Muslim countries. Scandinavian tourist companies have cancelled tours to North Africa. â€¢ Foreign aid: Muslim aggression against aid workers in Indonesia, Lebanon, Pakistan and the Palestinian Authority has led to the partial or complete withdrawal of European missions. In Chechnya, the Danish aid mission has been expelled, and the Iraqi transport ministry has rejected any future offers of Danish reconstruction money. â€¢ Embassies: From the seizure of the US embassy in Teheran in 1978 to the multiple attacks on Danish and other European embassies this month, the assault on Western diplomatic missions in Muslim countries is causing them to take on the features of armed fortresses, to remove from the center of towns to the peripheries, and in some cases to close down. â€¢ Westerners providing services: Zayed University in Dubai fired an American professor, Claudi Keepoz, for distributing the Muhammad cartoons to her students. Rampaging Palestinians caused the foreign observers staffing the Temporary International Presence in Hebron, or TIPH, to flee Hebron. THESE DEVELOPMENTS suggest what the prime minister of Malaysia, Abdullah Ahmad Badawi, has called a "huge chasm" between the Muslim world and the West. Or, in the more bellicose wording of the influential Sunni imam Youssef al-Qaradawi, "We must tell Europeans, we can live without you. But you cannot live without us." Should the chasm widen, with its concomitant lessening of human interaction, commercial relations and diplomatic engagement, the Muslim world will likely fall further behind than it already has. As I wrote in 2000, "Whatever index one employs, Muslims can be found clustering toward the bottom - whether measured in terms of their military prowess, political stability, economic development, clean government, human rights, health, longevity, or literacy." Disengagement will only worsen the Muslim predicament. Reduced contact with the world's most modern, powerful and advanced countries would likely cause Muslims to do even worse in those indices and lapse deeper into a condition characterized by self-pity, jealousy, resentment, anger and aggression. Especially when contrasted with Muslim successes in premodern times, these traumatic circumstances help explain the crisis in identity that often causes Muslims to seek solace in radical Islam. For everyone's sake, it is important that Muslims begin more successfully to negotiate their path to modernity, not to isolation. The writer, based in Philadelphia, is director of the Middle East Forum.