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The original TI-30 was notable for its very low cost for the time, around US$25. This was much less than the retail prices of other scientific calculators of the era; for example, Hewlett-Packard's cheapest scientific calculator at the time was still well over $100. The Casio FX-20, another popular scientific calculator, sold for roughly double ...
Bhattacharya, Holden, and Jacobsen (2011) examined the left-digit effect in stock market transactions. They found that there was excess buying at just-below prices ($1.99) versus round numbers ($2.00) right above them. This discrepancy in buy-sell can lead to significant changes in 24-hour returns that can meaningfully impact markets. [15]