Business in Mathematica (Consumer Side)

In the country of Mathematica, there are two citizens: Calvin and Daniel. Consider the following actions:

  1. Calvin purchases a calculator made in Mathematica.
  2. Calvin purchases a calculator made in Algebria, a foreign country.
  3. Calvin purchases calculator parts made in Mathematica to build his own calculator
  4. Calvin builds his own calculator from spare parts.
  5. Daniel sells a used calculator to Calvin.
  6. Daniel breaks his calculator and pays a repairman to fix it.
  7. Daniel invests in the Mathematica stock market.
  8. Daniel pays income tax to the government of Mathematica.

Which of those actions will increase the GDP of Mathematica? If your answer is statements n1,n2,,nk,n_1, n_2, \dots, n_k, enter the value of i=1k2ni1.\displaystyle \sum_{i=1}^k 2^{n_i - 1}.

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