Q.Which of the following nations adopted an 'open door' policy?

When Mao Zedong died in 1976, China faced a profound economic crisis. Decades of rigid central planning, the chaos of the Cultural Revolution, and isolation from global markets had left the economy stagnant, agriculture inefficient, and living standards desperately low. The question was how to modernise without abandoning socialism entirely or triggering the kind of collapse that would later devastate the Soviet Union.

Deng Xiaoping, who emerged as China's paramount leader by 1978, chose a fundamentally different path from the Soviet model. Instead of abrupt, wholesale liberalisation—the "shock therapy" that Russia would attempt in the 1990s—China adopted a cautious, incremental strategy. The approach was encapsulated in Deng's famous metaphor: "crossing the river by feeling the stones." Reform would proceed step by step, testing each measure before moving to the next.

The core of this strategy was the gradual opening of the economy to private enterprise and market forces. China began in agriculture, dismantling collective farms and allowing peasant families to sell surplus produce in free markets. The results were immediate and dramatic: food production soared. Emboldened, the government then established Special Economic Zones in coastal areas like Shenzhen, where foreign investment was welcomed, private businesses could operate, and capitalist practices were permitted as experiments. Only after these proved successful did China extend similar reforms inland and to other sectors.

This phased privatisation allowed the Communist Party to retain political control while unleashing economic dynamism. State-owned enterprises were gradually reformed rather than suddenly sold off. Township and Village Enterprises—hybrid entities that blurred the line between public and private—flourished. The economy grew at breathtaking speed, lifting hundreds of millions out of poverty, yet the transition avoided the unemployment shocks, hyperinflation, and social disintegration that accompanied Russia's big-bang reforms.

While China did indeed open diplomatic and trade relations with many countries and later became an export powerhouse, these were consequences and components of the broader reform strategy, not the defining measure. The heart of the solution was the controlled, experimental opening of the economy to private initiative.

Understanding the global economic landscape involves looking at the Gross Domestic Product (GDP) of nations, which measures the total value of goods and services produced within a country's borders in a given year. This metric is a primary indicator of a country's economic size and influence on the world stage. The rankings of the largest economies often reflect long-standing industrial strength, technological advancement, and trade capabilities.

In 2017, the United States maintained its position as the world's largest economy, a testament to its vast domestic market, diverse industries, and innovation. Following closely, China had firmly established itself as the second largest economy, driven by rapid industrialization, massive population, and increasing global trade integration.

The third position in 2017 was occupied by Japan. Japan has historically been a global economic powerhouse, known for its highly advanced technology, robust manufacturing sector, and significant export capabilities, particularly in automobiles and electronics. Despite facing demographic challenges and periods of slow growth, its economic output remained substantial enough to secure the third spot globally.

Among the other options provided:

• Germany was the fourth largest economy in 2017. It is Europe's largest economy, renowned for its engineering, automotive industry, and strong export performance.
• France typically ranked among the top ten economies but was generally behind Germany in terms of overall GDP. Its economy is characterized by a mix of private enterprise and government intervention, with strong sectors in aerospace, tourism, and luxury goods.
• South Korea, while a significant economic player and a leader in technology and manufacturing, had a smaller overall GDP compared to Japan, Germany, or France in 2017, placing it further down the global rankings.