Table 2.

Results without the pandemic.

Mode	Condition	Optimal decisions	Optimal profits
Self-building mode	if$Q<Q_0$	$p^{\ast }=v_1(1-Q)$, $k^{\ast }=\frac{1+c}{2}$	${\mathrm{\Pi }}_s^{1\ast }=\frac{{(1-c)}^{2}Q}{4}+Q(1-Q)v_1$
	if$Q⩾Q_0$	$p^{\ast }=\frac{v_1}{\text{2}}-\frac{{(1-c)}^2}{8}$,$k^{\ast }=\frac{1+c}{2}$	${\mathrm{\Pi }}_s^{1\ast }=\frac{{(4v_1+{(1-c)}^2)}^2}{64v_1}$
Platform mode	if$0<Q<Q_1$	${\tau }^{\ast }=v_1(1-\frac{Q}{\gamma })$,$p^{\ast }=v_1(1-\frac{Q}{\gamma })$	${\mathrm{\Pi }}_s^{2\ast }=v_{1}Q(1-\frac{Q}{\gamma })k$,${\mathrm{\Pi }}_o^{2\ast }=({\tau }^{\ast }+k)(1-k)Q$
	if$Q_1⩽Q⩽Q_2$	${\tau }^{\ast }=\frac{(2Q-\gamma )v_1}{(1-k)\gamma }$,$p^{\ast }=v_1(1-\frac{Q}{\gamma })$	${\mathrm{\Pi }}_s^{2\ast }=\frac{v_1{Q}^2}{\gamma }$,${\mathrm{\Pi }}_o^{2\ast }=({\tau }^{\ast }+k)(1-k)Q$
	if$Q>Q_2$	${\tau }^{\ast }=\frac{v_1-k(1-k)}{2(1-k)}$,$p^{\ast }=\frac{k^2+(3v_1-k)}{4}$	${\mathrm{\Pi }}_s^{2\ast }=\frac{\gamma {(k^2-k-v_1)}^2}{16v_1}$,${\mathrm{\Pi }}_o^{2\ast }=\frac{\gamma {(k^2-k-v_1)}^2}{8v_1}$