[time_series_with_matrices] Editorial Suggestions

[HumphreyYang]

• Remove bold "multiplier-accelerator model" and make them italic.
• Chang the "this QuantEcon lecture" to lecture name with a link.
• Explain what second-order means: It is called second order because $y_t$ depends on two lags.
• Add link for steady state.
• Add links for Eugen Slutsky in the lecture.
• Add link for IID.
• "Notice how the population variance increases and asymptotes" -> "Notice how the population variance increases and asymptotes."
• "This is is an indication" -> "This is an indication".
• Fix the code inconsistency (@HumphreyYang).
• Fix the right corner code (@SylviaZhaooo).
• "super diagonal" -> "superdiagonal".
• remove "another lecture in this lecture".
• Add some comments (links) on the invertibility of the matrices.
• Change emphasis for italics.
• Add an exercise for this lecture
• "backwards looking" -> "backward looking"

[mmcky]

@HumphreyYang would you have time to champion the closure of this issue re: last few items?

[HumphreyYang]

Hi @mmcky,

I just realized that the previous PR, which is marked as ready, has not yet been merged.

I will push my changes and merge main once that PR is merged.

[mbek0605]

• Align matrices better by rounding the figures to 2-3 decimal places. By aligning the matrices, we can see the diagonals and super diagonals like here:

• Follow PEPE standards, put each variable in a new line like:
  
• Write 28.0 and 24.0 in the image above instead of simply “28.” and “24.”
• Suggestion: 35.5 cut either the upper left-hand corner of A^-1 or the lower right-hand corner of A^-1.
• Globally set the numbers to 3 decimal places rather than doing it block by block.
• Suggestion: instead of A ̃ have A^(-1)
• Add that if we’re doing an infinite horizon, the situation is different. So, basically, answer the question: “Can you explain why the trend of the price is downward over time?” Emphasize pricing on the finite horizon and add exercise with that emphasis.

[jstac]

Closing — substantively done. The \tilde A → A^{-1} notation cleanup is addressed in #757. The remaining two items (adding an exercise; adding a finite-horizon / downward-price-trend discussion in the forward-looking section) are design suggestions rather than defects — happy to see them re-filed as a focused follow-up if anyone wants to pursue them.