Your ability to make money begins in the womb, according to research from Russia's Higher School of Economics. The key factor is the level of testosterone a fetus is exposed to in the womb.

Previous studies have shown that the amount of testosterone a fetus is exposed to influences finger length. Adults whose index finger is shorter than their ring finger were exposed to greater amounts of testosterone when they were in the womb. It's widely known as the 2D:4D ratio or the digit ratio.

The new study, which was published in the journal Economics and Human Biology, studied men and women between the ages of 25 and 60. It found that those who had longer ring fingers were more likely to be financially successful, and the lower the digit ratio — the longer the ring finger was in comparison to the index finger — the higher the salary.

A previous study at the University of Cambridge found that men with longer ring fingers were more likely to be successful as financial traders, and linked the physical characteristic with increased confidence, quick reaction times, persistence, and a higher tolerance for risk-taking.

Other characteristics have been associated with the 2D:4D ratio. A Norwegian study found that a comparison of your index and ring fingers suggests whether you are likely to be a good athlete with longer ring fingers indicating enhanced athletic ability.

Studies have also shown a link between high levels of testosterone in the womb with an increased risk of developing diseases that are more common in men, such as ADHD, Tourette's, and autism.

Low levels of testosterone are associated with an increased risk of developing diseases that are more common in women, like anxiety and depression. But low levels of testosterone are associated with better abilities in verbal memory tasks, such as remembering lists of words.