After a trader buys a 10 natural rubber futures contract at a price of 28,280 yuan/ton, the following operations are in line with the pyramid-like Masukura principle: ().

Answer: b, c

Pyramid opening positions is a way to increase contract positions, that is, if the market trend after opening positions is the same as expected and speculators have made profits, they can increase positions. Masukura should follow the following two principles: (1) Masukura can only be increased if the existing position is profitable. (2) The increase of positions should be gradually reduced.

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