A: One of the characteristics of education investment is: ① Long cycle. It takes a long time and process for educational investment to transform into educational ability and give full play to the economic benefits of education. ② High elasticity. Education should meet the needs of the development of material production. For material production, education investment has certain flexibility. ③ Indirectness. Education investment cannot be directly combined with material means of production, nor will it directly produce social material wealth. Only by combining the labor force, the specialized personnel trained by educational investment and the reproduction science and technology with material production can we create social material wealth and economic benefits. 4 long-term. The social labor force and specialized talents trained by education can play a permanent role as long as they work in the material production department. Even after retraining in the workplace, the original educational function is still the foundation and still plays a role. Education can transform scientific inventions into production technology for a longer time. In addition, education investment also has the characteristics of multiple effects, high efficiency and special effects.