๐ฑ Week 7 Homework โ Feedback
๐ฑ Week 7 Homework โ Feedback
Student: Matteo Pugliese
Assignment: Solow Model with Technological & Population Growth
โ Overall Assessment
Result: โ More than 50% Correct
Good submission with correct helper function and proper parameter calibration. The code runs cleanly and produces clear subplot figures. The main gaps are: (1) missing steady-state reference lines on both plots, (2) no printed steady-state summary, and (3) interpretation could be more structured. The economic discussion is present but could explicitly address both homework questions.
๐ Task-by-Task Checklist
| # | Requirement | Status | Notes |
|---|---|---|---|
| 1 | Separate simulate_growth_tech.m helper with correct signature |
โ | Provided with four outputs. |
| 2 | Helper preallocates arrays and final values | โ | Row vectors, final period handled via vectorized operations. |
| 3 | Law of motion divides by (1+n)(1+g) |
โ | Correct implementation. |
| 4 | Technology path updates with (1+g) |
โ | Included in loop. |
| 5 | Main script sets required parameters (ฮฑ, ฮด, s, T=80, k0, A0) |
โ | Matches homework specification. |
| 6 | Scenario matrix includes (0,0), (0.01,0.02), (0.02,0.03) |
โ | Stored in ng_values. |
| 7 | Reuses simulation outputs for later steps | โ | Stores results in cell array. |
| 8 | Plot k_t for the three scenarios |
โ | Top subplot shows all paths. |
| 9 | Add steady-state reference lines on k_t plot |
โ | Missing yline overlays. |
| 10 | Plot y_t/A_t for the three scenarios |
โ | Bottom subplot implemented. |
| 11 | Add steady-state reference lines on y_t/A_t plot |
โ | Missing yline overlays. |
| 12 | Save figures to Figures/ (PNG/PDF) |
โ | Saved to Figures_homework/ as .fig. |
| 13 | Provide steady-state summary (table or print) | โ | No numerical output of k*/(y/A)*. |
| 14 | Interpretation answers both homework questions | โ ๏ธ | Comments present but not explicitly structured. |
| 15 | Code hygiene (comments, no cd, folder guard) |
โ | Clean structure, no absolute paths. |
Score: 9/15 tasks fully correct, 1/15 partial, 5/15 missing โ โ
๐ Evidence & Highlights
29:54:docs/week7/Homework submissions/week7_homework_solution Matteo Pugliese/week7_homework_sub.m
subplot(2,1,1);
hold on;
for i = 1:size(results,1)
plot(1:T, results{i}.k, 'LineWidth', 1.8);
end
...
subplot(2,1,2);
hold on;
for i = 1:size(results,1)
plot(1:T, results{i}.y ./ results{i}.A, 'LineWidth', 1.8);
end
๐ก Suggestions for Improvement
- Add steady-state reference lines: Include
ylineoverlays on both subplots showingk*and(y/A)*for each scenario. Calculate these usingk_star = (s / (delta + n + g + n*g))^(1/(1-alpha))andy_star = k_star^alpha. - Print steady-state summary: Add a
fprintfblock that reportsk*and(y/A)*for each scenario before the interpretation section. - Structure the interpretation: Explicitly answer: (a) how higher
n/gaffect steady-state levels per effective worker, and (b) what happens to convergence speed. Your current comments touch on these but could be more direct.
๐งพ Summary
Solid implementation with correct economics. Adding steady-state overlays and a quantitative summary will make the submission complete and align with homework expectations.
Grade: โ (More than 50% correct)