noun
speculative spirit; speculative mindset
Refers to a mindset or inclination toward speculation, especially in financial contexts, but can also apply to other areas where one takes risks for potential gain.
彼の投機心が、株式市場での大きな成功につながった。
His speculative spirit led to great success in the stock market.
投機心を抑えて、堅実な投資を心がけよう。
Let's curb our speculative mindset and aim for steady investments.
投資 means investment in general, often with a connotation of long-term, stable growth, whereas 投機心 implies a risk-taking, speculative attitude.
Compound of 投機 (speculation) and 心 (mind/spirit). The exact historical derivation is uncertain, but the word likely emerged in modern financial contexts.