What percentage of transactions fail due to accessibility errors?

From personal experience, shopping online as a blind user is extremely difficult. Inaccessibility blocks purchases almost daily. One example: a 500 euro event registration couldn’t be completed because the form wasn’t accessible.

Studies show that around 70% of blind users’ initiated transactions fail due to barriers. For ecommerce, this is a direct revenue loss.
To understand the scale of the problem, there are more than 80 million people with disabilities in the EU and over 60 million in the U.S. If 70% of transactions for blind users fail, the ecommerce industry is leaving billions in revenue on the table.

Accessibility issues affect more than just people with permanent disabilities. Poorly coded forms and broken checkout flows also frustrate elderly users, people with temporary impairments (like a broken arm), or customers shopping in low-light environments.

Related questions

What are the most common ecommerce accessibility barriers that stop purchases?