Sony was once the largest electronics company in the world due to innovations like the Walkman personal music player. However, Sony struggled due to a "Not Invented Here" syndrome where it was reluctant to adopt industry standards it did not create itself. This caused products like the Betamax video format to fail against competitors like VHS. Sony also failed to capitalize on new markets like digital music players, allowing Apple to dominate with the iPod. As a result, Sony's market value declined drastically from $100 billion to $18 billion, and it began losing billions of dollars. Sony's insular culture and failure to adapt to new standards and markets caused it to lose its dominance in the consumer electronics industry.