Which of these spices is the most sold worldwide?

Pungent, earthy, hot, woody, brash—pepper’s distinct flavor somehow pairs well with just about any savory food, and some sweet ones, too. If salt helps bring out flavors, black pepper makes foods bolder versions of themselves. The wrinkled little peppercorn has played a big role in the history of food. It is the world's most important spice, due to its near-worldwide popularity and the effect meeting its demand had on global trade and exploration. It has long been thought to contain healing qualities—Sanskrit medical volumes dating back more than 3,000 years include advice on how to administer it.

Source: Serious Eats